gitlab-org--gitlab-foss/app/assets/stylesheets/themes/gitlab-theme.scss

@mixin gitlab-theme($color-light, $color, $color-darker, $color-dark) {
  header {
    &.navbar-gitlab {
      .header-logo {
        background-color: $color-darker;
        border-color: $color-darker;

        a {
          color: $color-light;
        }

        &:hover {
          background-color: $color-dark;
          a {
            color: #FFF;
          }
        }
      }
    }
  }

  .page-with-sidebar {
    .collapse-nav a {
      color: #FFF;
      background: $color;
    }

    .sidebar-wrapper {
      background: $color-darker;
      border-right: 1px solid $color-darker;

      .sidebar-user {
        color: $color-light;

        &:hover {
          background-color: $color-dark;
          color: #FFF;
          text-decoration: none;
        }
      }
    }

    .nav-sidebar li {
      a {
        color: $color-light;

        &:hover, &:focus, &:active {
          background: $color-dark;
        }

        i {
          color: $color-light;
        }

        .count {
          color: $color-light;
          background: $color-dark;
        }
      }

      &.separate-item {
        border-top: 1px solid $color;
      }

      &.active a {
        color: #FFF;
        font-weight: bold;

        &.no-highlight {
          border: none;
        }

        i {
          color: #FFF
        }
      }
    }
  }
}