diff --git a/app/assets/stylesheets/framework/mobile.scss b/app/assets/stylesheets/framework/mobile.scss
index 6244fb86fea..033e5e57177 100644
--- a/app/assets/stylesheets/framework/mobile.scss
+++ b/app/assets/stylesheets/framework/mobile.scss
@@ -4,11 +4,6 @@
     margin-top: 20px;
   }
 
-  .container-fluid {
-    padding-left: 5px;
-    padding-right: 5px;
-  }
-
   .nav-links > li > a {
     padding: 10px;
     font-size: 12px;
diff --git a/changelogs/unreleased/50879-unused-css-container-fluid.yml b/changelogs/unreleased/50879-unused-css-container-fluid.yml
new file mode 100644
index 00000000000..3f706472523
--- /dev/null
+++ b/changelogs/unreleased/50879-unused-css-container-fluid.yml
@@ -0,0 +1,5 @@
+---
+title: Remove unused CSS part in mobile framework
+merge_request: 21439
+author: Takuya Noguchi
+type: other