diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js
index 4b5c9686cab..5d7350ad7be 100644
--- a/app/assets/javascripts/application.js
+++ b/app/assets/javascripts/application.js
@@ -101,11 +101,6 @@ require('es6-promise').polyfill();
       }
     });
 
-    $('.nav-sidebar').niceScroll({
-      cursoropacitymax: '0.4',
-      cursorcolor: '#FFF',
-      cursorborder: '1px solid #FFF'
-    });
     $('.js-select-on-focus').on('focusin', function () {
       return $(this).select().one('mouseup', function (e) {
         return e.preventDefault();
@@ -245,8 +240,6 @@ require('es6-promise').polyfill();
     });
     gl.awardsHandler = new AwardsHandler();
     new Aside();
-    // bind sidebar events
-    new gl.Sidebar();
 
     gl.utils.initTimeagoTimeout();
   });
diff --git a/app/assets/javascripts/project_label_subscription.js.es6 b/app/assets/javascripts/project_label_subscription.js.es6
index 8365f7118d5..0a811627600 100644
--- a/app/assets/javascripts/project_label_subscription.js.es6
+++ b/app/assets/javascripts/project_label_subscription.js.es6
@@ -38,13 +38,15 @@
         this.$buttons.attr('data-status', newStatus);
         this.$buttons.find('> span').text(newAction);
 
-        for (const button of this.$buttons) {
+        this.$buttons.map((button) => {
           const $button = $(button);
 
           if ($button.attr('data-original-title')) {
             $button.tooltip('hide').attr('data-original-title', newAction).tooltip('fixTitle');
           }
-        }
+
+          return button;
+        });
       });
     }
   }
diff --git a/app/assets/javascripts/right_sidebar.js b/app/assets/javascripts/right_sidebar.js
index 76a0f993ea0..f8e42e7a350 100644
--- a/app/assets/javascripts/right_sidebar.js
+++ b/app/assets/javascripts/right_sidebar.js
@@ -21,11 +21,16 @@
     };
 
     Sidebar.prototype.addEventListeners = function() {
+      const $document = $(document);
+      const throttledSetSidebarHeight = _.throttle(this.setSidebarHeight, 10);
+
       this.sidebar.on('click', '.sidebar-collapsed-icon', this, this.sidebarCollapseClicked);
       $('.dropdown').on('hidden.gl.dropdown', this, this.onSidebarDropdownHidden);
       $('.dropdown').on('loading.gl.dropdown', this.sidebarDropdownLoading);
       $('.dropdown').on('loaded.gl.dropdown', this.sidebarDropdownLoaded);
-      $(document).on('click', '.js-sidebar-toggle', function(e, triggered) {
+      $(window).on('resize', () => throttledSetSidebarHeight());
+      $document.on('scroll', () => throttledSetSidebarHeight());
+      $document.on('click', '.js-sidebar-toggle', function(e, triggered) {
         var $allGutterToggleIcons, $this, $thisIcon;
         e.preventDefault();
         $this = $(this);
@@ -191,6 +196,17 @@
       }
     };
 
+    Sidebar.prototype.setSidebarHeight = function() {
+      const $navHeight = $('.navbar-gitlab').outerHeight() + $('.layout-nav').outerHeight();
+      const $rightSidebar = $('.js-right-sidebar');
+      const diff = $navHeight - $('body').scrollTop();
+      if (diff > 0) {
+        $rightSidebar.outerHeight($(window).height() - diff);
+      } else {
+        $rightSidebar.outerHeight('100%');
+      }
+    };
+
     Sidebar.prototype.isOpen = function() {
       return this.sidebar.is('.right-sidebar-expanded');
     };
diff --git a/app/assets/javascripts/sidebar.js.es6 b/app/assets/javascripts/sidebar.js.es6
deleted file mode 100644
index 33e4b7db681..00000000000
--- a/app/assets/javascripts/sidebar.js.es6
+++ /dev/null
@@ -1,111 +0,0 @@
-/* eslint-disable arrow-parens, class-methods-use-this, no-param-reassign */
-/* global Cookies */
-
-(() => {
-  const pinnedStateCookie = 'pin_nav';
-  const sidebarBreakpoint = 1024;
-
-  const pageSelector = '.page-with-sidebar';
-  const navbarSelector = '.navbar-gitlab';
-  const sidebarWrapperSelector = '.sidebar-wrapper';
-  const sidebarContentSelector = '.nav-sidebar';
-
-  const pinnedToggleSelector = '.js-nav-pin';
-  const sidebarToggleSelector = '.toggle-nav-collapse, .side-nav-toggle';
-
-  const pinnedPageClass = 'page-sidebar-pinned';
-  const expandedPageClass = 'page-sidebar-expanded';
-
-  const pinnedNavbarClass = 'header-sidebar-pinned';
-  const expandedNavbarClass = 'header-sidebar-expanded';
-
-  class Sidebar {
-    constructor() {
-      if (!Sidebar.singleton) {
-        Sidebar.singleton = this;
-        Sidebar.singleton.init();
-      }
-
-      return Sidebar.singleton;
-    }
-
-    init() {
-      this.isPinned = Cookies.get(pinnedStateCookie) === 'true';
-      this.isExpanded = (
-        window.innerWidth >= sidebarBreakpoint &&
-        $(pageSelector).hasClass(expandedPageClass)
-      );
-      $(window).on('resize', () => this.setSidebarHeight());
-      $(document)
-        .on('click', sidebarToggleSelector, () => this.toggleSidebar())
-        .on('click', pinnedToggleSelector, () => this.togglePinnedState())
-        .on('click', 'html, body, a, button', (e) => this.handleClickEvent(e))
-        .on('DOMContentLoaded', () => this.renderState())
-        .on('scroll', () => this.setSidebarHeight())
-        .on('todo:toggle', (e, count) => this.updateTodoCount(count));
-      this.renderState();
-      this.setSidebarHeight();
-    }
-
-    handleClickEvent(e) {
-      if (this.isExpanded && (!this.isPinned || window.innerWidth < sidebarBreakpoint)) {
-        const $target = $(e.target);
-        const targetIsToggle = $target.closest(sidebarToggleSelector).length > 0;
-        const targetIsSidebar = $target.closest(sidebarWrapperSelector).length > 0;
-        if (!targetIsToggle && (!targetIsSidebar || $target.closest('a'))) {
-          this.toggleSidebar();
-        }
-      }
-    }
-
-    updateTodoCount(count) {
-      $('.js-todos-count').text(gl.text.addDelimiter(count));
-    }
-
-    toggleSidebar() {
-      this.isExpanded = !this.isExpanded;
-      this.renderState();
-    }
-
-    setSidebarHeight() {
-      const $navHeight = $('.navbar-gitlab').outerHeight() + $('.layout-nav').outerHeight();
-      const diff = $navHeight - $('body').scrollTop();
-      if (diff > 0) {
-        $('.js-right-sidebar').outerHeight($(window).height() - diff);
-      } else {
-        $('.js-right-sidebar').outerHeight('100%');
-      }
-    }
-
-    togglePinnedState() {
-      this.isPinned = !this.isPinned;
-      if (!this.isPinned) {
-        this.isExpanded = false;
-      }
-      Cookies.set(pinnedStateCookie, this.isPinned ? 'true' : 'false', { expires: 3650 });
-      this.renderState();
-    }
-
-    renderState() {
-      $(pageSelector)
-        .toggleClass(pinnedPageClass, this.isPinned && this.isExpanded)
-        .toggleClass(expandedPageClass, this.isExpanded);
-      $(navbarSelector)
-        .toggleClass(pinnedNavbarClass, this.isPinned && this.isExpanded)
-        .toggleClass(expandedNavbarClass, this.isExpanded);
-
-      const $pinnedToggle = $(pinnedToggleSelector);
-      const tooltipText = this.isPinned ? 'Unpin navigation' : 'Pin navigation';
-      const tooltipState = $pinnedToggle.attr('aria-describedby') && this.isExpanded ? 'show' : 'hide';
-      $pinnedToggle.attr('title', tooltipText).tooltip('fixTitle').tooltip(tooltipState);
-
-      if (this.isExpanded) {
-        const sidebarContent = $(sidebarContentSelector);
-        setTimeout(() => { sidebarContent.niceScroll().updateScrollBar(); }, 200);
-      }
-    }
-  }
-
-  window.gl = window.gl || {};
-  gl.Sidebar = Sidebar;
-})();
diff --git a/app/assets/stylesheets/framework.scss b/app/assets/stylesheets/framework.scss
index 08f203a1bf6..39cf3b5f8ae 100644
--- a/app/assets/stylesheets/framework.scss
+++ b/app/assets/stylesheets/framework.scss
@@ -19,7 +19,6 @@
 @import "framework/flash.scss";
 @import "framework/forms.scss";
 @import "framework/gfm.scss";
-@import "framework/gitlab-theme.scss";
 @import "framework/header.scss";
 @import "framework/highlight.scss";
 @import "framework/issue_box.scss";
diff --git a/app/assets/stylesheets/framework/animations.scss b/app/assets/stylesheets/framework/animations.scss
index 0ca5a9343f7..90935b9616b 100644
--- a/app/assets/stylesheets/framework/animations.scss
+++ b/app/assets/stylesheets/framework/animations.scss
@@ -116,7 +116,7 @@
 }
 
 .btn,
-.side-nav-toggle {
+.global-dropdown-toggle {
   @include transition(background-color, border-color, color, box-shadow);
 }
 
@@ -140,7 +140,6 @@ a {
   @include transition(background-color, box-shadow);
 }
 
-.nav-sidebar a,
 .dropdown-menu a,
 .dropdown-menu button,
 .dropdown-menu-nav a {
diff --git a/app/assets/stylesheets/framework/gitlab-theme.scss b/app/assets/stylesheets/framework/gitlab-theme.scss
deleted file mode 100644
index d6566dc4ec9..00000000000
--- a/app/assets/stylesheets/framework/gitlab-theme.scss
+++ /dev/null
@@ -1,144 +0,0 @@
-/**
- * Styles the GitLab application with a specific color theme
- *
- * $color-light  -
- * $color        -
- * $color-darker -
- * $color-dark   -
- */
-@mixin gitlab-theme($color-light, $color, $color-darker, $color-dark) {
-  .page-with-sidebar {
-    .toggle-nav-collapse,
-    .pin-nav-btn {
-      color: $color-light;
-
-      &:hover {
-        color: $white-light;
-      }
-    }
-
-    .sidebar-wrapper {
-      background: $color-darker;
-    }
-
-    .sidebar-action-buttons {
-      color: $color-light;
-      background-color: lighten($color-darker, 5%);
-    }
-
-    .nav-sidebar {
-      li {
-        a {
-          color: $color-light;
-
-          &:hover,
-          &:focus,
-          &:active {
-            background: $color-dark;
-          }
-
-          i {
-            color: $color-light;
-          }
-
-          path,
-          polygon {
-            fill: $color-light;
-          }
-
-          .count {
-            color: $color-light;
-            background: $color-dark;
-          }
-
-          svg {
-            position: relative;
-            top: 3px;
-          }
-        }
-
-        &.separate-item {
-          border-top: 1px solid $color;
-        }
-
-        &.active a {
-          color: $white-light;
-          background: $color-dark;
-
-          &.no-highlight {
-            border: none;
-          }
-
-          i {
-            color: $white-light;
-          }
-
-          path,
-          polygon {
-            fill: $white-light;
-          }
-        }
-      }
-
-      .about-gitlab {
-        color: $color-light;
-      }
-    }
-  }
-}
-
-$theme-charcoal-light: #b9bbbe;
-$theme-charcoal: #485157;
-$theme-charcoal-dark: #3d454d;
-$theme-charcoal-darker: #383f45;
-
-$theme-blue-light: #becde9;
-$theme-blue: #2980b9;
-$theme-blue-dark: #1970a9;
-$theme-blue-darker: #096099;
-
-$theme-graphite-light: #ccc;
-$theme-graphite: #777;
-$theme-graphite-dark: #666;
-$theme-graphite-darker: #555;
-
-$theme-black-light: #979797;
-$theme-black: #373737;
-$theme-black-dark: #272727;
-$theme-black-darker: #222;
-
-$theme-green-light: #adc;
-$theme-green: #019875;
-$theme-green-dark: #018865;
-$theme-green-darker: #017855;
-
-$theme-violet-light: #98c;
-$theme-violet: #548;
-$theme-violet-dark: #436;
-$theme-violet-darker: #325;
-
-body {
-  &.ui_blue {
-    @include gitlab-theme($theme-blue-light, $theme-blue, $theme-blue-dark, $theme-blue-darker);
-  }
-
-  &.ui_charcoal {
-    @include gitlab-theme($theme-charcoal-light, $theme-charcoal, $theme-charcoal-dark, $theme-charcoal-darker);
-  }
-
-  &.ui_graphite {
-    @include gitlab-theme($theme-graphite-light, $theme-graphite, $theme-graphite-dark, $theme-graphite-darker);
-  }
-
-  &.ui_black {
-    @include gitlab-theme($theme-black-light, $theme-black, $theme-black-dark, $theme-black-darker);
-  }
-
-  &.ui_green {
-    @include gitlab-theme($theme-green-light, $theme-green, $theme-green-dark, $theme-green-darker);
-  }
-
-  &.ui_violet {
-    @include gitlab-theme($theme-violet-light, $theme-violet, $theme-violet-dark, $theme-violet-darker);
-  }
-}
diff --git a/app/assets/stylesheets/framework/header.scss b/app/assets/stylesheets/framework/header.scss
index 34e010e0e8a..367289968c9 100644
--- a/app/assets/stylesheets/framework/header.scss
+++ b/app/assets/stylesheets/framework/header.scss
@@ -100,23 +100,42 @@ header {
         }
       }
     }
+  }
 
-    .side-nav-toggle {
-      position: absolute;
-      left: -10px;
-      margin: 7px 0;
-      font-size: 18px;
-      padding: 6px 10px;
-      border: none;
-      background-color: $gray-light;
+  .global-dropdown {
+    position: absolute;
+    left: -10px;
+
+    .badge {
+      font-size: 11px;
+    }
+
+    li {
+      .active a {
+        font-weight: bold;
+      }
 
       &:hover {
-        background-color: $white-normal;
-        color: $gl-header-nav-hover-color;
+        .badge {
+          background-color: $white-light;
+        }
       }
     }
   }
 
+  .global-dropdown-toggle {
+    margin: 7px 0;
+    font-size: 18px;
+    padding: 6px 10px;
+    border: none;
+    background-color: $gray-light;
+
+    &:hover {
+      background-color: $white-normal;
+      color: $gl-header-nav-hover-color;
+    }
+  }
+
   .header-content {
     position: relative;
     height: $header-height;
diff --git a/app/assets/stylesheets/framework/sidebar.scss b/app/assets/stylesheets/framework/sidebar.scss
index 20bcb1eeb23..d09b1c9d7f5 100644
--- a/app/assets/stylesheets/framework/sidebar.scss
+++ b/app/assets/stylesheets/framework/sidebar.scss
@@ -1,36 +1,3 @@
-.page-with-sidebar {
-  padding-bottom: 25px;
-  transition: padding $sidebar-transition-duration;
-
-  &.page-sidebar-pinned {
-    .sidebar-wrapper {
-      box-shadow: none;
-    }
-  }
-
-  .sidebar-wrapper {
-    position: fixed;
-    top: 0;
-    bottom: 0;
-    left: 0;
-    height: 100%;
-    width: 0;
-    overflow: hidden;
-    transition: width $sidebar-transition-duration;
-    box-shadow: 2px 0 16px 0 $black-transparent;
-  }
-}
-
-.sidebar-wrapper {
-  z-index: 1000;
-  background: $gray-light;
-
-  .nicescroll-rails-hr {
-    // TODO: Figure out why nicescroll doesn't hide horizontal bar
-    display: none!important;
-  }
-}
-
 .content-wrapper {
   width: 100%;
   transition: padding $sidebar-transition-duration;
@@ -47,105 +14,6 @@
   }
 }
 
-.nav-sidebar {
-  position: absolute;
-  top: 50px;
-  bottom: 0;
-  width: $sidebar_width;
-  overflow-y: auto;
-  overflow-x: hidden;
-
-  &.navbar-collapse {
-    padding: 0 !important;
-  }
-
-  li {
-    &.separate-item {
-      padding-top: 10px;
-      margin-top: 10px;
-    }
-
-    .icon-container {
-      width: 34px;
-      display: inline-block;
-      text-align: center;
-    }
-
-    a {
-      padding: 7px $gl-sidebar-padding;
-      font-size: $gl-font-size;
-      line-height: 24px;
-      display: block;
-      text-decoration: none;
-      font-weight: normal;
-
-      &:hover,
-      &:active,
-      &:focus {
-        text-decoration: none;
-      }
-
-      i {
-        font-size: 16px;
-      }
-
-      i,
-      svg {
-        margin-right: 13px;
-      }
-    }
-  }
-
-  .count {
-    float: right;
-    padding: 0 8px;
-    border-radius: 6px;
-  }
-
-  .about-gitlab {
-    padding: 7px $gl-sidebar-padding;
-    font-size: $gl-font-size;
-    line-height: 24px;
-    display: block;
-    text-decoration: none;
-    font-weight: normal;
-    position: absolute;
-    bottom: 10px;
-  }
-}
-
-.sidebar-action-buttons {
-  width: $sidebar_width;
-  position: absolute;
-  top: 0;
-  left: 0;
-  min-height: 50px;
-  padding: 5px 0;
-  font-size: 18px;
-  line-height: 30px;
-
-  .toggle-nav-collapse {
-    left: 0;
-  }
-
-  .pin-nav-btn {
-    right: 0;
-    display: none;
-
-    @media (min-width: $sidebar-breakpoint) {
-      display: block;
-    }
-
-    .fa {
-      transition: transform .15s;
-
-      .page-sidebar-pinned & {
-        transform: rotate(90deg);
-      }
-    }
-  }
-}
-
 .nav-header-btn {
   padding: 10px $gl-sidebar-padding;
   color: inherit;
@@ -161,59 +29,16 @@
   }
 }
 
-.page-sidebar-expanded {
-  .sidebar-wrapper {
-    width: $sidebar_width;
-  }
-}
-
-.page-sidebar-pinned {
-  .content-wrapper,
-  .layout-nav {
-    @media (min-width: $sidebar-breakpoint) {
-      padding-left: $sidebar_width;
-    }
-  }
-
-  .merge-request-tabs-holder.affix {
-    @media (min-width: $sidebar-breakpoint) {
-      left: $sidebar_width;
-    }
-  }
-
-  &.right-sidebar-expanded {
-    .line-resolve-all-container {
-      @media (min-width: $sidebar-breakpoint) {
-        display: none;
-      }
-    }
-  }
-}
-
-header.header-sidebar-pinned {
-  @media (min-width: $sidebar-breakpoint) {
-    padding-left: ($sidebar_width + $gl-padding);
-
-    .side-nav-toggle {
-      display: none;
-    }
-
-    .header-content {
-      padding-left: 0;
-    }
-  }
-}
-
 .right-sidebar-collapsed {
   padding-right: 0;
 
   @media (min-width: $screen-sm-min) {
     .content-wrapper {
-      padding-right: $sidebar_collapsed_width;
+      padding-right: $gutter_collapsed_width;
     }
 
     .merge-request-tabs-holder.affix {
-      right: $sidebar_collapsed_width;
+      right: $gutter_collapsed_width;
     }
   }
 
@@ -231,7 +56,7 @@ header.header-sidebar-pinned {
 
   @media (min-width: $screen-sm-min) and (max-width: $screen-sm-max) {
     &:not(.build-sidebar):not(.wiki-sidebar) {
-      padding-right: $sidebar_collapsed_width;
+      padding-right: $gutter_collapsed_width;
     }
   }
 
@@ -245,12 +70,12 @@ header.header-sidebar-pinned {
     }
 
     &.with-overlay .merge-request-tabs-holder.affix {
-      right: $sidebar_collapsed_width;
+      right: $gutter_collapsed_width;
     }
   }
 
   &.with-overlay {
-    padding-right: $sidebar_collapsed_width;
+    padding-right: $gutter_collapsed_width;
   }
 }
 
diff --git a/app/assets/stylesheets/framework/variables.scss b/app/assets/stylesheets/framework/variables.scss
index 7809d4866f1..ba0af072716 100644
--- a/app/assets/stylesheets/framework/variables.scss
+++ b/app/assets/stylesheets/framework/variables.scss
@@ -1,8 +1,6 @@
 /*
  * Layout
  */
-$sidebar_collapsed_width: 62px;
-$sidebar_width: 220px;
 $gutter_collapsed_width: 62px;
 $gutter_width: 290px;
 $gutter_inner_width: 250px;
@@ -541,4 +539,4 @@ Pipeline Graph
 */
 $stage-hover-bg: #eaf3fc;
 $stage-hover-border: #d1e7fc;
-$action-icon-color: #d6d6d6;
\ No newline at end of file
+$action-icon-color: #d6d6d6;
diff --git a/app/assets/stylesheets/pages/issuable.scss b/app/assets/stylesheets/pages/issuable.scss
index a53cc27fac9..4426169ef5a 100644
--- a/app/assets/stylesheets/pages/issuable.scss
+++ b/app/assets/stylesheets/pages/issuable.scss
@@ -253,11 +253,11 @@
       display: block;
     }
 
-    width: $sidebar_collapsed_width;
+    width: $gutter_collapsed_width;
     padding-top: 0;
 
     .block {
-      width: $sidebar_collapsed_width - 2px;
+      width: $gutter_collapsed_width - 2px;
       margin-left: -19px;
       padding: 15px 0 0;
       border-bottom: none;
diff --git a/app/assets/stylesheets/pages/profiles/preferences.scss b/app/assets/stylesheets/pages/profiles/preferences.scss
index 100ace41f2a..305feaacaa1 100644
--- a/app/assets/stylesheets/pages/profiles/preferences.scss
+++ b/app/assets/stylesheets/pages/profiles/preferences.scss
@@ -1,42 +1,3 @@
-.application-theme {
-  label {
-    margin-right: 20px;
-    text-align: center;
-
-    .preview {
-      border-radius: 4px;
-
-      height: 80px;
-      margin-bottom: 10px;
-      width: 160px;
-
-      &.ui_blue {
-        background: $theme-blue;
-      }
-
-      &.ui_charcoal {
-        background: $theme-charcoal;
-      }
-
-      &.ui_graphite {
-        background: $theme-graphite;
-      }
-
-      &.ui_black {
-        background: $theme-black;
-      }
-
-      &.ui_green {
-        background: $theme-green;
-      }
-
-      &.ui_violet {
-        background: $theme-violet;
-      }
-    }
-  }
-}
-
 .syntax-theme {
   label {
     margin-right: 20px;
diff --git a/app/assets/stylesheets/print.scss b/app/assets/stylesheets/print.scss
index 0ff3c3f5472..6cc1cc8e263 100644
--- a/app/assets/stylesheets/print.scss
+++ b/app/assets/stylesheets/print.scss
@@ -31,7 +31,6 @@ nav.navbar-collapse.collapse,
 .blob-commit-info,
 .file-title,
 .file-holder,
-.sidebar-wrapper,
 .nav,
 .btn,
 ul.notes-form,
diff --git a/app/controllers/admin/users_controller.rb b/app/controllers/admin/users_controller.rb
index 1cd50852e89..7ffde71c3b1 100644
--- a/app/controllers/admin/users_controller.rb
+++ b/app/controllers/admin/users_controller.rb
@@ -194,7 +194,6 @@ class Admin::UsersController < Admin::ApplicationController
       :provider,
       :remember_me,
       :skype,
-      :theme_id,
       :twitter,
       :username,
       :website_url
diff --git a/app/controllers/profiles/preferences_controller.rb b/app/controllers/profiles/preferences_controller.rb
index a9a06ecc808..0d891ef4004 100644
--- a/app/controllers/profiles/preferences_controller.rb
+++ b/app/controllers/profiles/preferences_controller.rb
@@ -34,7 +34,6 @@ class Profiles::PreferencesController < Profiles::ApplicationController
       :layout,
       :dashboard,
       :project_view,
-      :theme_id
     )
   end
 end
diff --git a/app/helpers/nav_helper.rb b/app/helpers/nav_helper.rb
index e21178c7377..c1523b4dabf 100644
--- a/app/helpers/nav_helper.rb
+++ b/app/helpers/nav_helper.rb
@@ -1,10 +1,4 @@
 module NavHelper
-  def page_sidebar_class
-    if pinned_nav?
-      "page-sidebar-expanded page-sidebar-pinned"
-    end
-  end
-
   def page_gutter_class
     if current_path?('merge_requests#show') ||
         current_path?('merge_requests#diffs') ||
@@ -32,10 +26,6 @@ module NavHelper
     class_name = ''
     class_name << " with-horizontal-nav" if defined?(nav) && nav
 
-    if pinned_nav?
-      class_name << " header-sidebar-expanded header-sidebar-pinned"
-    end
-
     class_name
   end
 
@@ -46,8 +36,4 @@ module NavHelper
   def nav_control_class
     "nav-control" if current_user
   end
-
-  def pinned_nav?
-    cookies[:pin_nav] == 'true'
-  end
 end
diff --git a/app/helpers/preferences_helper.rb b/app/helpers/preferences_helper.rb
index dd0a4ea03f0..c3a08d76318 100644
--- a/app/helpers/preferences_helper.rb
+++ b/app/helpers/preferences_helper.rb
@@ -41,10 +41,6 @@ module PreferencesHelper
     ]
   end
 
-  def user_application_theme
-    Gitlab::Themes.for_user(current_user).css_class
-  end
-
   def user_color_scheme
     Gitlab::ColorSchemes.for_user(current_user).css_class
   end
diff --git a/app/models/user.rb b/app/models/user.rb
index ad997ce2b13..f614eb66e1f 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -21,7 +21,6 @@ class User < ActiveRecord::Base
   default_value_for :can_create_team, false
   default_value_for :hide_no_ssh_key, false
   default_value_for :hide_no_password, false
-  default_value_for :theme_id, gitlab_config.default_theme
 
   attr_encrypted :otp_secret,
     key:       Gitlab::Application.secrets.otp_key_base,
diff --git a/app/views/layouts/_page.html.haml b/app/views/layouts/_page.html.haml
index 54d02ee8e4b..a35a918d501 100644
--- a/app/views/layouts/_page.html.haml
+++ b/app/views/layouts/_page.html.haml
@@ -1,21 +1,4 @@
-.page-with-sidebar{ class: "#{page_sidebar_class} #{page_gutter_class}" }
-  .sidebar-wrapper.nicescroll
-    .sidebar-action-buttons
-      .nav-header-btn.toggle-nav-collapse{ title: "Open/Close" }
-        %span.sr-only Toggle navigation
-        = icon('bars')
-
-      %div{ class: "nav-header-btn pin-nav-btn has-tooltip #{'is-active' if pinned_nav?} js-nav-pin", title: pinned_nav? ? "Unpin navigation" : "Pin Navigation", data: { placement: 'right', container: 'body' } }
-        %span.sr-only Toggle navigation pinning
-        = icon('fw thumb-tack')
-
-    - if defined?(sidebar) && sidebar
-      = render "layouts/nav/#{sidebar}"
-    - elsif current_user
-      = render 'layouts/nav/dashboard'
-    - else
-      = render 'layouts/nav/explore'
-
+.page-with-sidebar{ class: page_gutter_class }
   - if defined?(nav) && nav
     .layout-nav
       .container-fluid
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index 248d439cd05..19bd9b6d5c9 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -1,7 +1,7 @@
 !!! 5
 %html{ lang: "en", class: "#{page_class}" }
   = render "layouts/head"
-  %body{ class: "#{user_application_theme}", data: { page: body_data_page, project: "#{@project.path if @project}", group: "#{@group.path if @group}" } }
+  %body{ data: { page: body_data_page, project: "#{@project.path if @project}", group: "#{@group.path if @group}" } }
     = Gon::Base.render_data
 
     = render "layouts/header/default", title: header_title
diff --git a/app/views/layouts/header/_default.html.haml b/app/views/layouts/header/_default.html.haml
index 59082ce5fd5..ddf50d6667f 100644
--- a/app/views/layouts/header/_default.html.haml
+++ b/app/views/layouts/header/_default.html.haml
@@ -2,9 +2,15 @@
   %a.sr-only.gl-accessibility{ href: "#content-body", tabindex: "1" } Skip to content
   .container-fluid
     .header-content
-      %button.side-nav-toggle{ type: 'button', "aria-label" => "Toggle global navigation" }
-        %span.sr-only Toggle navigation
-        = icon('bars')
+      .dropdown.global-dropdown
+        %button.global-dropdown-toggle{ type: 'button', 'data-toggle' => 'dropdown' }
+          %span.sr-only Toggle navigation
+          = icon('bars')
+        .dropdown-menu-nav.global-dropdown-menu
+          - if current_user
+            = render 'layouts/nav/dashboard'
+          - else
+            = render 'layouts/nav/explore'
       %button.navbar-toggle{ type: 'button' }
         %span.sr-only Toggle navigation
         = icon('ellipsis-v')
@@ -55,7 +61,6 @@
               %div
                 = link_to "Sign in", new_session_path(:user, redirect_to_referer: 'yes'), class: 'btn btn-sign-in btn-success'
 
-
       %h1.title= title
 
       .header-logo
diff --git a/app/views/layouts/nav/_dashboard.html.haml b/app/views/layouts/nav/_dashboard.html.haml
index 205d23178d2..bb611d39be5 100644
--- a/app/views/layouts/nav/_dashboard.html.haml
+++ b/app/views/layouts/nav/_dashboard.html.haml
@@ -1,41 +1,39 @@
-.nav-sidebar
-  %ul.nav
-    = nav_link(path: ['root#index', 'projects#trending', 'projects#starred', 'dashboard/projects#index'], html_options: {class: "#{project_tab_class} home"}) do
-      = link_to dashboard_projects_path, title: 'Projects', class: 'dashboard-shortcuts-projects' do
-        %span
-          Projects
-    = nav_link(path: 'dashboard#activity') do
-      = link_to activity_dashboard_path, class: 'dashboard-shortcuts-activity', title: 'Activity' do
-        %span
-          Activity
-    - if koding_enabled?
-      = nav_link(controller: :koding) do
-        = link_to koding_path, title: 'Koding' do
-          %span
-            Koding
-    = nav_link(controller: [:groups, 'groups/milestones', 'groups/group_members']) do
-      = link_to dashboard_groups_path, title: 'Groups' do
-        %span
-          Groups
-    = nav_link(controller: 'dashboard/milestones') do
-      = link_to dashboard_milestones_path, title: 'Milestones' do
-        %span
-          Milestones
-    = nav_link(path: 'dashboard#issues') do
-      = link_to assigned_issues_dashboard_path, title: 'Issues', class: 'dashboard-shortcuts-issues' do
-        %span
-          Issues
-          %span.count= number_with_delimiter(cached_assigned_issuables_count(current_user, :issues, :opened))
-    = nav_link(path: 'dashboard#merge_requests') do
-      = link_to assigned_mrs_dashboard_path, title: 'Merge Requests', class: 'dashboard-shortcuts-merge_requests' do
-        %span
-          Merge Requests
-          %span.count= number_with_delimiter(cached_assigned_issuables_count(current_user, :merge_requests, :opened))
-    = nav_link(controller: 'dashboard/snippets') do
-      = link_to dashboard_snippets_path, title: 'Snippets' do
-        %span
-          Snippets
-
-    = link_to help_path, title: 'About GitLab CE', class: 'about-gitlab' do
+%ul
+  = nav_link(path: ['root#index', 'projects#trending', 'projects#starred', 'dashboard/projects#index'], html_options: {class: "#{project_tab_class} home"}) do
+    = link_to dashboard_projects_path, title: 'Projects', class: 'dashboard-shortcuts-projects' do
       %span
-        About GitLab CE
+        Projects
+  = nav_link(path: 'dashboard#activity') do
+    = link_to activity_dashboard_path, class: 'dashboard-shortcuts-activity', title: 'Activity' do
+      %span
+        Activity
+  - if koding_enabled?
+    = nav_link(controller: :koding) do
+      = link_to koding_path, title: 'Koding' do
+        %span
+          Koding
+  = nav_link(controller: [:groups, 'groups/milestones', 'groups/group_members']) do
+    = link_to dashboard_groups_path, title: 'Groups' do
+      %span
+        Groups
+  = nav_link(controller: 'dashboard/milestones') do
+    = link_to dashboard_milestones_path, title: 'Milestones' do
+      %span
+        Milestones
+  = nav_link(path: 'dashboard#issues') do
+    = link_to assigned_issues_dashboard_path, title: 'Issues', class: 'dashboard-shortcuts-issues' do
+      %span
+        Issues
+        %span.badge= number_with_delimiter(cached_assigned_issuables_count(current_user, :issues, :opened))
+  = nav_link(path: 'dashboard#merge_requests') do
+    = link_to assigned_mrs_dashboard_path, title: 'Merge Requests', class: 'dashboard-shortcuts-merge_requests' do
+      %span
+        Merge Requests
+        %span.badge= number_with_delimiter(cached_assigned_issuables_count(current_user, :merge_requests, :opened))
+  = nav_link(controller: 'dashboard/snippets') do
+    = link_to dashboard_snippets_path, title: 'Snippets' do
+      %span
+        Snippets
+  %li.divider
+  %li
+    = link_to "About GitLab CE", help_path, title: 'About GitLab CE', class: 'about-gitlab'
diff --git a/app/views/layouts/nav/_explore.html.haml b/app/views/layouts/nav/_explore.html.haml
index e5bda7b3a6f..3a1fcd00e9c 100644
--- a/app/views/layouts/nav/_explore.html.haml
+++ b/app/views/layouts/nav/_explore.html.haml
@@ -1,4 +1,4 @@
-%ul.nav.nav-sidebar
+%ul
   = nav_link(path: ['dashboard#show', 'root#show', 'projects#trending', 'projects#starred', 'projects#index'], html_options: {class: 'home'}) do
     = link_to explore_root_path, title: 'Projects' do
       %span
diff --git a/app/views/profiles/preferences/show.html.haml b/app/views/profiles/preferences/show.html.haml
index feadd863b00..787339e0fe2 100644
--- a/app/views/profiles/preferences/show.html.haml
+++ b/app/views/profiles/preferences/show.html.haml
@@ -7,12 +7,6 @@
       Application theme
     %p
       This setting allows you to customize the appearance of the site, e.g. the sidebar.
-  .col-lg-9.application-theme
-    - Gitlab::Themes.each do |theme|
-      = label_tag do
-        .preview{ class: theme.css_class }
-        = f.radio_button :theme_id, theme.id
-        = theme.name
   .col-sm-12
     %hr
   .col-lg-3.profile-settings-sidebar
diff --git a/app/views/profiles/preferences/update.js.erb b/app/views/profiles/preferences/update.js.erb
index 8966dd3fd86..431ab9d052b 100644
--- a/app/views/profiles/preferences/update.js.erb
+++ b/app/views/profiles/preferences/update.js.erb
@@ -1,7 +1,3 @@
-// Remove body class for any previous theme, re-add current one
-$('body').removeClass('<%= Gitlab::Themes.body_classes %>')
-$('body').addClass('<%= user_application_theme %>')
-
 // Toggle container-fluid class
 if ('<%= current_user.layout %>' === 'fluid') {
   $('.content-wrapper .container-fluid').removeClass('container-limited')
diff --git a/config/gitlab.yml.example b/config/gitlab.yml.example
index cc1af77a1de..a82ff605a70 100644
--- a/config/gitlab.yml.example
+++ b/config/gitlab.yml.example
@@ -76,14 +76,6 @@ production: &base
 
     # default_can_create_group: false  # default: true
     # username_changing_enabled: false # default: true - User can change her username/namespace
-    ## Default theme ID
-    ##   1 - Graphite
-    ##   2 - Charcoal
-    ##   3 - Green
-    ##   4 - Gray
-    ##   5 - Violet
-    ##   6 - Blue
-    # default_theme: 2 # default: 2
 
     ## Automatic issue closing
     # If a commit message matches this regular expression, all issues referenced from the matched text will be closed.
@@ -611,4 +603,4 @@ test:
         admin_group: ''
 
 staging:
-  <<: *base
\ No newline at end of file
+  <<: *base
diff --git a/config/initializers/1_settings.rb b/config/initializers/1_settings.rb
index ab59394cb0c..3f716dd8833 100644
--- a/config/initializers/1_settings.rb
+++ b/config/initializers/1_settings.rb
@@ -183,7 +183,6 @@ Settings['gitlab'] ||= Settingslogic.new({})
 Settings.gitlab['default_projects_limit'] ||= 10
 Settings.gitlab['default_branch_protection'] ||= 2
 Settings.gitlab['default_can_create_group'] = true if Settings.gitlab['default_can_create_group'].nil?
-Settings.gitlab['default_theme'] = Gitlab::Themes::APPLICATION_DEFAULT if Settings.gitlab['default_theme'].nil?
 Settings.gitlab['host']       ||= ENV['GITLAB_HOST'] || 'localhost'
 Settings.gitlab['ssh_host']   ||= Settings.gitlab.host
 Settings.gitlab['https']        = false if Settings.gitlab['https'].nil?
diff --git a/db/post_migrate/20170215200045_remove_theme_id_from_users.rb b/db/post_migrate/20170215200045_remove_theme_id_from_users.rb
new file mode 100644
index 00000000000..c51646fbe52
--- /dev/null
+++ b/db/post_migrate/20170215200045_remove_theme_id_from_users.rb
@@ -0,0 +1,9 @@
+class RemoveThemeIdFromUsers < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    remove_column :users, :theme_id, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 52672406ec6..e0208dab3d3 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170214111112) do
+ActiveRecord::Schema.define(version: 20170215200045) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1238,7 +1238,6 @@ ActiveRecord::Schema.define(version: 20170214111112) do
     t.string "linkedin", default: "", null: false
     t.string "twitter", default: "", null: false
     t.string "authentication_token"
-    t.integer "theme_id", default: 1, null: false
     t.string "bio"
     t.integer "failed_attempts", default: 0
     t.datetime "locked_at"
@@ -1351,4 +1350,4 @@ ActiveRecord::Schema.define(version: 20170214111112) do
   add_foreign_key "timelogs", "merge_requests", name: "fk_timelogs_merge_requests_merge_request_id", on_delete: :cascade
   add_foreign_key "trending_projects", "projects", on_delete: :cascade
   add_foreign_key "u2f_registrations", "users"
-end
\ No newline at end of file
+end
diff --git a/doc/api/keys.md b/doc/api/keys.md
index b68f08a007d..3b55c2baf56 100644
--- a/doc/api/keys.md
+++ b/doc/api/keys.md
@@ -33,7 +33,6 @@ Parameters:
     "twitter": "",
     "website_url": "",
     "email": "john@example.com",
-    "theme_id": 2,
     "color_scheme_id": 1,
     "projects_limit": 10,
     "current_sign_in_at": null,
diff --git a/doc/api/session.md b/doc/api/session.md
index f776424023e..d7809716fbe 100644
--- a/doc/api/session.md
+++ b/doc/api/session.md
@@ -41,7 +41,6 @@ Example response:
   "twitter": "",
   "website_url": "",
   "email": "john@example.com",
-  "theme_id": 1,
   "color_scheme_id": 1,
   "projects_limit": 10,
   "current_sign_in_at": "2015-07-07T07:10:58.392Z",
diff --git a/doc/api/users.md b/doc/api/users.md
index ed3469521fc..626f7e63e3e 100644
--- a/doc/api/users.md
+++ b/doc/api/users.md
@@ -72,7 +72,6 @@ GET /users
     "organization": "",
     "last_sign_in_at": "2012-06-01T11:41:01Z",
     "confirmed_at": "2012-05-23T09:05:22Z",
-    "theme_id": 1,
     "color_scheme_id": 2,
     "projects_limit": 100,
     "current_sign_in_at": "2012-06-02T06:36:55Z",
@@ -105,7 +104,6 @@ GET /users
     "organization": "",
     "last_sign_in_at": null,
     "confirmed_at": "2012-05-30T16:53:06.148Z",
-    "theme_id": 1,
     "color_scheme_id": 3,
     "projects_limit": 100,
     "current_sign_in_at": "2014-03-19T17:54:13Z",
@@ -198,7 +196,6 @@ Parameters:
   "organization": "",
   "last_sign_in_at": "2012-06-01T11:41:01Z",
   "confirmed_at": "2012-05-23T09:05:22Z",
-  "theme_id": 1,
   "color_scheme_id": 2,
   "projects_limit": 100,
   "current_sign_in_at": "2012-06-02T06:36:55Z",
@@ -323,7 +320,6 @@ GET /user
   "organization": "",
   "last_sign_in_at": "2012-06-01T11:41:01Z",
   "confirmed_at": "2012-05-23T09:05:22Z",
-  "theme_id": 1,
   "color_scheme_id": 2,
   "projects_limit": 100,
   "current_sign_in_at": "2012-06-02T06:36:55Z",
@@ -369,7 +365,6 @@ GET /user
   "organization": "",
   "last_sign_in_at": "2012-06-01T11:41:01Z",
   "confirmed_at": "2012-05-23T09:05:22Z",
-  "theme_id": 1,
   "color_scheme_id": 2,
   "projects_limit": 100,
   "current_sign_in_at": "2012-06-02T06:36:55Z",
diff --git a/features/project/labels.feature b/features/project/labels.feature
deleted file mode 100644
index 955bc3d8b1b..00000000000
--- a/features/project/labels.feature
+++ /dev/null
@@ -1,15 +0,0 @@
-@labels
-Feature: Labels
-  Background:
-    Given I sign in as a user
-    And I own project "Shop"
-    And project "Shop" has labels: "bug", "feature", "enhancement"
-    When I visit project "Shop" labels page
-
-  @javascript
-  Scenario: I can subscribe to a label
-    Then I should see that I am not subscribed to the "bug" label
-    When I click button "Subscribe" for the "bug" label
-    Then I should see that I am subscribed to the "bug" label
-    When I click button "Unsubscribe" for the "bug" label
-    Then I should see that I am not subscribed to the "bug" label
diff --git a/features/steps/project/labels.rb b/features/steps/project/labels.rb
deleted file mode 100644
index dbeb07c78db..00000000000
--- a/features/steps/project/labels.rb
+++ /dev/null
@@ -1,32 +0,0 @@
-class Spinach::Features::Labels < Spinach::FeatureSteps
-  include SharedAuthentication
-  include SharedIssuable
-  include SharedProject
-  include SharedPaths
-
-  step 'And I visit project "Shop" labels page' do
-    visit namespace_project_labels_path(project.namespace, project)
-  end
-
-  step 'I should see that I am subscribed to the "bug" label' do
-    expect(subscribe_button).to have_content 'Unsubscribe'
-  end
-
-  step 'I should see that I am not subscribed to the "bug" label' do
-    expect(subscribe_button).to have_content 'Subscribe'
-  end
-
-  step 'I click button "Unsubscribe" for the "bug" label' do
-    subscribe_button.click
-  end
-
-  step 'I click button "Subscribe" for the "bug" label' do
-    subscribe_button.click
-  end
-
-  private
-
-  def subscribe_button
-    first('.js-subscribe-button', visible: true)
-  end
-end
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 232f231ddd2..400ee7c92aa 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -26,7 +26,7 @@ module API
       expose :last_sign_in_at
       expose :confirmed_at
       expose :email
-      expose :theme_id, :color_scheme_id, :projects_limit, :current_sign_in_at
+      expose :color_scheme_id, :projects_limit, :current_sign_in_at
       expose :identities, using: Entities::Identity
       expose :can_create_group?, as: :can_create_group
       expose :can_create_project?, as: :can_create_project
diff --git a/lib/gitlab/themes.rb b/lib/gitlab/themes.rb
deleted file mode 100644
index 19ab76ae80f..00000000000
--- a/lib/gitlab/themes.rb
+++ /dev/null
@@ -1,87 +0,0 @@
-module Gitlab
-  # Module containing GitLab's application theme definitions and helper methods
-  # for accessing them.
-  module Themes
-    extend self
-
-    # Theme ID used when no `default_theme` configuration setting is provided.
-    APPLICATION_DEFAULT = 2
-
-    # Struct class representing a single Theme
-    Theme = Struct.new(:id, :name, :css_class)
-
-    # All available Themes
-    THEMES = [
-      Theme.new(1, 'Graphite', 'ui_graphite'),
-      Theme.new(2, 'Charcoal', 'ui_charcoal'),
-      Theme.new(3, 'Green',    'ui_green'),
-      Theme.new(4, 'Black',    'ui_black'),
-      Theme.new(5, 'Violet',   'ui_violet'),
-      Theme.new(6, 'Blue',     'ui_blue')
-    ].freeze
-
-    # Convenience method to get a space-separated String of all the theme
-    # classes that might be applied to the `body` element
-    #
-    # Returns a String
-    def body_classes
-      THEMES.collect(&:css_class).uniq.join(' ')
-    end
-
-    # Get a Theme by its ID
-    #
-    # If the ID is invalid, returns the default Theme.
-    #
-    # id - Integer ID
-    #
-    # Returns a Theme
-    def by_id(id)
-      THEMES.detect { |t| t.id == id } || default
-    end
-
-    # Returns the number of defined Themes
-    def count
-      THEMES.size
-    end
-
-    # Get the default Theme
-    #
-    # Returns a Theme
-    def default
-      by_id(default_id)
-    end
-
-    # Iterate through each Theme
-    #
-    # Yields the Theme object
-    def each(&block)
-      THEMES.each(&block)
-    end
-
-    # Get the Theme for the specified user, or the default
-    #
-    # user - User record
-    #
-    # Returns a Theme
-    def for_user(user)
-      if user
-        by_id(user.theme_id)
-      else
-        default
-      end
-    end
-
-    private
-
-    def default_id
-      id = Gitlab.config.gitlab.default_theme.to_i
-
-      # Prevent an invalid configuration setting from causing an infinite loop
-      if id < THEMES.first.id || id > THEMES.last.id
-        APPLICATION_DEFAULT
-      else
-        id
-      end
-    end
-  end
-end
diff --git a/spec/controllers/profiles/preferences_controller_spec.rb b/spec/controllers/profiles/preferences_controller_spec.rb
index 8f02003992a..7b3aa0491c7 100644
--- a/spec/controllers/profiles/preferences_controller_spec.rb
+++ b/spec/controllers/profiles/preferences_controller_spec.rb
@@ -25,8 +25,7 @@ describe Profiles::PreferencesController do
     def go(params: {}, format: :js)
       params.reverse_merge!(
         color_scheme_id: '1',
-        dashboard: 'stars',
-        theme_id: '1'
+        dashboard: 'stars'
       )
 
       patch :update, user: params, format: format
@@ -41,8 +40,7 @@ describe Profiles::PreferencesController do
       it "changes the user's preferences" do
         prefs = {
           color_scheme_id: '1',
-          dashboard: 'stars',
-          theme_id: '2'
+          dashboard: 'stars'
         }.with_indifferent_access
 
         expect(user).to receive(:update_attributes).with(prefs)
diff --git a/spec/features/dashboard/active_tab_spec.rb b/spec/features/dashboard/active_tab_spec.rb
index 7d59fcac517..ae750be4d4a 100644
--- a/spec/features/dashboard/active_tab_spec.rb
+++ b/spec/features/dashboard/active_tab_spec.rb
@@ -1,14 +1,15 @@
 require 'spec_helper'
 
-RSpec.describe 'Dashboard Active Tab', feature: true do
+RSpec.describe 'Dashboard Active Tab', js: true, feature: true do
   before do
     login_as :user
   end
 
   shared_examples 'page has active tab' do |title|
     it "#{title} tab" do
-      expect(page).to have_selector('.nav-sidebar li.active', count: 1)
-      expect(find('.nav-sidebar li.active')).to have_content(title)
+      find('.global-dropdown-toggle').trigger('click')
+      expect(page).to have_selector('.global-dropdown-menu li.active', count: 1)
+      expect(find('.global-dropdown-menu li.active')).to have_content(title)
     end
   end
 
diff --git a/spec/features/dashboard/issuables_counter_spec.rb b/spec/features/dashboard/issuables_counter_spec.rb
index 41dcfe439c2..603076d7d37 100644
--- a/spec/features/dashboard/issuables_counter_spec.rb
+++ b/spec/features/dashboard/issuables_counter_spec.rb
@@ -36,7 +36,8 @@ describe 'Navigation bar counter', feature: true, js: true, caching: true do
 
   def expect_counters(issuable_type, count)
     dashboard_count = find('li.active span.badge')
-    nav_count = find(".dashboard-shortcuts-#{issuable_type} span.count")
+    find('.global-dropdown-toggle').click
+    nav_count = find(".dashboard-shortcuts-#{issuable_type} span.badge")
 
     expect(nav_count).to have_content(count)
     expect(dashboard_count).to have_content(count)
diff --git a/spec/features/dashboard/shortcuts_spec.rb b/spec/features/dashboard/shortcuts_spec.rb
index d9be4e5dbdd..62a2c54c94c 100644
--- a/spec/features/dashboard/shortcuts_spec.rb
+++ b/spec/features/dashboard/shortcuts_spec.rb
@@ -10,20 +10,20 @@ feature 'Dashboard shortcuts', feature: true, js: true do
     find('body').native.send_key('g')
     find('body').native.send_key('p')
 
-    ensure_active_main_tab('Projects')
+    check_page_title('Projects')
 
     find('body').native.send_key('g')
     find('body').native.send_key('i')
 
-    ensure_active_main_tab('Issues')
+    check_page_title('Issues')
 
     find('body').native.send_key('g')
     find('body').native.send_key('m')
 
-    ensure_active_main_tab('Merge Requests')
+    check_page_title('Merge Requests')
   end
 
-  def ensure_active_main_tab(content)
-    expect(find('.nav-sidebar li.active')).to have_content(content)
+  def check_page_title(title)
+    expect(find('.header-content .title')).to have_content(title)
   end
 end
diff --git a/spec/features/profiles/preferences_spec.rb b/spec/features/profiles/preferences_spec.rb
index a6b841c0210..15c8677fcd3 100644
--- a/spec/features/profiles/preferences_spec.rb
+++ b/spec/features/profiles/preferences_spec.rb
@@ -8,35 +8,6 @@ describe 'Profile > Preferences', feature: true do
     visit profile_preferences_path
   end
 
-  describe 'User changes their application theme', js: true do
-    let(:default) { Gitlab::Themes.default }
-    let(:theme)   { Gitlab::Themes.by_id(5) }
-
-    it 'creates a flash message' do
-      choose "user_theme_id_#{theme.id}"
-
-      expect_preferences_saved_message
-    end
-
-    it 'updates their preference' do
-      choose "user_theme_id_#{theme.id}"
-
-      allowing_for_delay do
-        visit page.current_path
-        expect(page).to have_checked_field("user_theme_id_#{theme.id}")
-      end
-    end
-
-    it 'reflects the changes immediately' do
-      expect(page).to have_selector("body.#{default.css_class}")
-
-      choose "user_theme_id_#{theme.id}"
-
-      expect(page).not_to have_selector("body.#{default.css_class}")
-      expect(page).to have_selector("body.#{theme.css_class}")
-    end
-  end
-
   describe 'User changes their syntax highlighting theme', js: true do
     it 'creates a flash message' do
       choose 'user_color_scheme_id_5'
diff --git a/spec/fixtures/api/schemas/user/login.json b/spec/fixtures/api/schemas/user/login.json
index e6c1d9c9d84..6181b3ccc86 100644
--- a/spec/fixtures/api/schemas/user/login.json
+++ b/spec/fixtures/api/schemas/user/login.json
@@ -19,7 +19,6 @@
     "organization",
     "last_sign_in_at",
     "confirmed_at",
-    "theme_id",
     "color_scheme_id",
     "projects_limit",
     "current_sign_in_at",
diff --git a/spec/fixtures/api/schemas/user/public.json b/spec/fixtures/api/schemas/user/public.json
index dbd5d32e89c..5587cfec61a 100644
--- a/spec/fixtures/api/schemas/user/public.json
+++ b/spec/fixtures/api/schemas/user/public.json
@@ -19,7 +19,6 @@
     "organization",
     "last_sign_in_at",
     "confirmed_at",
-    "theme_id",
     "color_scheme_id",
     "projects_limit",
     "current_sign_in_at",
@@ -32,14 +31,14 @@
   "properties": {
     "id": { "type": "integer" },
     "username": { "type": "string" },
-    "email": { 
+    "email": {
       "type": "string",
       "pattern": "^[^@]+@[^@]+$"
     },
     "name": { "type": "string" },
-    "state": { 
+    "state": {
       "type": "string",
-      "enum": ["active", "blocked"] 
+      "enum": ["active", "blocked"]
     },
     "avatar_url": { "type": "string" },
     "web_url": { "type": "string" },
@@ -54,18 +53,17 @@
     "organization": { "type": ["string", "null"] },
     "last_sign_in_at": { "type": "date" },
     "confirmed_at": { "type": ["date", "null"] },
-    "theme_id": { "type": "integer" },
     "color_scheme_id": { "type": "integer" },
     "projects_limit": { "type": "integer" },
     "current_sign_in_at": { "type": "date" },
-    "identities": { 
+    "identities": {
       "type": "array",
       "items": {
         "type": "object",
         "properties": {
-          "provider": { 
+          "provider": {
             "type": "string",
-            "enum": ["github", "bitbucket", "google_oauth2"] 
+            "enum": ["github", "bitbucket", "google_oauth2"]
           },
           "extern_uid": { "type": ["number", "string"] }
         }
@@ -74,6 +72,6 @@
     "can_create_group": { "type": "boolean" },
     "can_create_project": { "type": "boolean" },
     "two_factor_enabled": { "type": "boolean" },
-    "external": { "type": "boolean" } 
+    "external": { "type": "boolean" }
   }
 }
diff --git a/spec/helpers/preferences_helper_spec.rb b/spec/helpers/preferences_helper_spec.rb
index 1f02e06e312..f3e79cc7290 100644
--- a/spec/helpers/preferences_helper_spec.rb
+++ b/spec/helpers/preferences_helper_spec.rb
@@ -26,32 +26,6 @@ describe PreferencesHelper do
     end
   end
 
-  describe 'user_application_theme' do
-    context 'with a user' do
-      it "returns user's theme's css_class" do
-        stub_user(theme_id: 3)
-
-        expect(helper.user_application_theme).to eq 'ui_green'
-      end
-
-      it 'returns the default when id is invalid' do
-        stub_user(theme_id: Gitlab::Themes.count + 5)
-
-        allow(Gitlab.config.gitlab).to receive(:default_theme).and_return(2)
-
-        expect(helper.user_application_theme).to eq 'ui_charcoal'
-      end
-    end
-
-    context 'without a user' do
-      it 'returns the default theme' do
-        stub_user
-
-        expect(helper.user_application_theme).to eq Gitlab::Themes.default.css_class
-      end
-    end
-  end
-
   describe 'user_color_scheme' do
     context 'with a user' do
       it "returns user's scheme's css_class" do
diff --git a/spec/javascripts/dashboard_spec.js.es6 b/spec/javascripts/dashboard_spec.js.es6
deleted file mode 100644
index c0bdb89ed63..00000000000
--- a/spec/javascripts/dashboard_spec.js.es6
+++ /dev/null
@@ -1,37 +0,0 @@
-/* eslint-disable no-new */
-
-require('~/sidebar');
-require('~/lib/utils/text_utility');
-
-((global) => {
-  describe('Dashboard', () => {
-    const fixtureTemplate = 'static/dashboard.html.raw';
-
-    function todosCountText() {
-      return $('.js-todos-count').text();
-    }
-
-    function triggerToggle(newCount) {
-      $(document).trigger('todo:toggle', newCount);
-    }
-
-    preloadFixtures(fixtureTemplate);
-    beforeEach(() => {
-      loadFixtures(fixtureTemplate);
-      new global.Sidebar();
-    });
-
-    it('should update todos-count after receiving the todo:toggle event', () => {
-      triggerToggle(5);
-      expect(todosCountText()).toEqual('5');
-    });
-
-    it('should display todos-count with delimiter', () => {
-      triggerToggle(1000);
-      expect(todosCountText()).toEqual('1,000');
-
-      triggerToggle(1000000);
-      expect(todosCountText()).toEqual('1,000,000');
-    });
-  });
-})(window.gl);
diff --git a/spec/javascripts/fixtures/dashboard.html.haml b/spec/javascripts/fixtures/dashboard.html.haml
deleted file mode 100644
index 32446acfd60..00000000000
--- a/spec/javascripts/fixtures/dashboard.html.haml
+++ /dev/null
@@ -1,45 +0,0 @@
-%ul.nav.nav-sidebar
-  %li.home.active
-    %a.dashboard-shortcuts-projects
-      %span
-        Projects
-  %li
-    %a
-      %span
-        Todos
-        %span.count.js-todos-count
-        1
-  %li
-    %a.dashboard-shortcuts-activity
-      %span
-        Activity
-  %li
-    %a
-      %span
-        Groups
-  %li
-    %a
-      %span
-        Milestones
-  %li
-    %a.dashboard-shortcuts-issues
-      %span
-        Issues
-        %span
-        1
-  %li
-    %a.dashboard-shortcuts-merge_requests
-      %span
-        Merge Requests
-  %li
-    %a
-      %span
-        Snippets
-  %li
-    %a
-      %span
-        Help
-  %li
-    %a
-      %span
-        Profile Settings
diff --git a/spec/javascripts/project_dashboard_spec.js.es6 b/spec/javascripts/project_dashboard_spec.js.es6
deleted file mode 100644
index 24833b4eb57..00000000000
--- a/spec/javascripts/project_dashboard_spec.js.es6
+++ /dev/null
@@ -1,86 +0,0 @@
-require('~/sidebar');
-
-(() => {
-  describe('Project dashboard page', () => {
-    let $pageWithSidebar = null;
-    let $sidebarToggle = null;
-    let sidebar = null;
-    const fixtureTemplate = 'projects/dashboard.html.raw';
-
-    const assertSidebarStateExpanded = (shouldBeExpanded) => {
-      expect(sidebar.isExpanded).toBe(shouldBeExpanded);
-      expect($pageWithSidebar.hasClass('page-sidebar-expanded')).toBe(shouldBeExpanded);
-    };
-
-    preloadFixtures(fixtureTemplate);
-    beforeEach(() => {
-      loadFixtures(fixtureTemplate);
-
-      $pageWithSidebar = $('.page-with-sidebar');
-      $sidebarToggle = $('.toggle-nav-collapse');
-
-      // otherwise instantiating the Sidebar for the second time
-      // won't do anything, as the Sidebar is a singleton class
-      gl.Sidebar.singleton = null;
-      sidebar = new gl.Sidebar();
-    });
-
-    it('can show the sidebar when the toggler is clicked', () => {
-      assertSidebarStateExpanded(false);
-      $sidebarToggle.click();
-      assertSidebarStateExpanded(true);
-    });
-
-    it('should dismiss the sidebar when clone button clicked', () => {
-      $sidebarToggle.click();
-      assertSidebarStateExpanded(true);
-
-      const cloneButton = $('.project-clone-holder a.clone-dropdown-btn');
-      cloneButton.click();
-      assertSidebarStateExpanded(false);
-    });
-
-    it('should dismiss the sidebar when download button clicked', () => {
-      $sidebarToggle.click();
-      assertSidebarStateExpanded(true);
-
-      const downloadButton = $('.project-action-button .btn:has(i.fa-download)');
-      downloadButton.click();
-      assertSidebarStateExpanded(false);
-    });
-
-    it('should dismiss the sidebar when add button clicked', () => {
-      $sidebarToggle.click();
-      assertSidebarStateExpanded(true);
-
-      const addButton = $('.project-action-button .btn:has(i.fa-plus)');
-      addButton.click();
-      assertSidebarStateExpanded(false);
-    });
-
-    it('should dismiss the sidebar when notification button clicked', () => {
-      $sidebarToggle.click();
-      assertSidebarStateExpanded(true);
-
-      const notifButton = $('.js-notification-toggle-btns .notifications-btn');
-      notifButton.click();
-      assertSidebarStateExpanded(false);
-    });
-
-    it('should dismiss the sidebar when clicking on the body', () => {
-      $sidebarToggle.click();
-      assertSidebarStateExpanded(true);
-
-      $('body').click();
-      assertSidebarStateExpanded(false);
-    });
-
-    it('should dismiss the sidebar when clicking on the project description header', () => {
-      $sidebarToggle.click();
-      assertSidebarStateExpanded(true);
-
-      $('.project-home-panel').click();
-      assertSidebarStateExpanded(false);
-    });
-  });
-})();
diff --git a/spec/lib/gitlab/themes_spec.rb b/spec/lib/gitlab/themes_spec.rb
deleted file mode 100644
index 7a140518dd2..00000000000
--- a/spec/lib/gitlab/themes_spec.rb
+++ /dev/null
@@ -1,48 +0,0 @@
-require 'spec_helper'
-
-describe Gitlab::Themes, lib: true do
-  describe '.body_classes' do
-    it 'returns a space-separated list of class names' do
-      css = described_class.body_classes
-
-      expect(css).to include('ui_graphite')
-      expect(css).to include(' ui_charcoal ')
-      expect(css).to include(' ui_blue')
-    end
-  end
-
-  describe '.by_id' do
-    it 'returns a Theme by its ID' do
-      expect(described_class.by_id(1).name).to eq 'Graphite'
-      expect(described_class.by_id(6).name).to eq 'Blue'
-    end
-  end
-
-  describe '.default' do
-    it 'returns the default application theme' do
-      allow(described_class).to receive(:default_id).and_return(2)
-      expect(described_class.default.id).to eq 2
-    end
-
-    it 'prevents an infinite loop when configuration default is invalid' do
-      default = described_class::APPLICATION_DEFAULT
-      themes  = described_class::THEMES
-
-      config = double(default_theme: 0).as_null_object
-      allow(Gitlab).to receive(:config).and_return(config)
-      expect(described_class.default.id).to eq default
-
-      config = double(default_theme: themes.size + 5).as_null_object
-      allow(Gitlab).to receive(:config).and_return(config)
-      expect(described_class.default.id).to eq default
-    end
-  end
-
-  describe '.each' do
-    it 'passes the block to the THEMES Array' do
-      ids = []
-      described_class.each { |theme| ids << theme.id }
-      expect(ids).not_to be_empty
-    end
-  end
-end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 89cef7ab978..584a4facd94 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -582,18 +582,16 @@ describe User, models: true do
       it "applies defaults to user" do
         expect(user.projects_limit).to eq(Gitlab.config.gitlab.default_projects_limit)
         expect(user.can_create_group).to eq(Gitlab.config.gitlab.default_can_create_group)
-        expect(user.theme_id).to eq(Gitlab.config.gitlab.default_theme)
         expect(user.external).to be_falsey
       end
     end
 
     describe 'with default overrides' do
-      let(:user) { User.new(projects_limit: 123, can_create_group: false, can_create_team: true, theme_id: 1) }
+      let(:user) { User.new(projects_limit: 123, can_create_group: false, can_create_team: true) }
 
       it "applies defaults to user" do
         expect(user.projects_limit).to eq(123)
         expect(user.can_create_group).to be_falsey
-        expect(user.theme_id).to eq(1)
       end
     end
 
diff --git a/spec/support/gitlab_stubs/session.json b/spec/support/gitlab_stubs/session.json
index ce8dfe5ae75..cd55d63125e 100644
--- a/spec/support/gitlab_stubs/session.json
+++ b/spec/support/gitlab_stubs/session.json
@@ -7,7 +7,7 @@
   "skype":"aertert",
   "linkedin":"",
   "twitter":"",
-  "theme_id":2,"color_scheme_id":2,
+  "color_scheme_id":2,
   "state":"active",
   "created_at":"2012-12-21T13:02:20Z",
   "extern_uid":null,
@@ -17,4 +17,4 @@
   "can_create_project":false,
   "private_token":"Wvjy2Krpb7y8xi93owUz",
   "access_token":"Wvjy2Krpb7y8xi93owUz"
-}
\ No newline at end of file
+}
diff --git a/spec/support/gitlab_stubs/user.json b/spec/support/gitlab_stubs/user.json
index ce8dfe5ae75..cd55d63125e 100644
--- a/spec/support/gitlab_stubs/user.json
+++ b/spec/support/gitlab_stubs/user.json
@@ -7,7 +7,7 @@
   "skype":"aertert",
   "linkedin":"",
   "twitter":"",
-  "theme_id":2,"color_scheme_id":2,
+  "color_scheme_id":2,
   "state":"active",
   "created_at":"2012-12-21T13:02:20Z",
   "extern_uid":null,
@@ -17,4 +17,4 @@
   "can_create_project":false,
   "private_token":"Wvjy2Krpb7y8xi93owUz",
   "access_token":"Wvjy2Krpb7y8xi93owUz"
-}
\ No newline at end of file
+}