diff --git a/app/assets/stylesheets/framework/header.scss b/app/assets/stylesheets/framework/header.scss
index 65b5f4af037cb63494b5231ff82d9491b173f64a..ce8b27a195114923b1a4b999ee4cf7ed4923e1dc 100644
--- a/app/assets/stylesheets/framework/header.scss
+++ b/app/assets/stylesheets/framework/header.scss
@@ -24,14 +24,13 @@ header {
 
   &.navbar-gitlab {
     padding: 0 16px;
-    z-index: 100;
+    z-index: 400;
     margin-bottom: 0;
     min-height: $header-height;
     background-color: $gray-light;
     border: none;
     border-bottom: 1px solid $border-color;
     position: fixed;
-    z-index: 300;
     top: 0;
     left: 0;
     right: 0;