diff --git a/src/core/public/chrome/ui/header/collapsible_nav_group_enabled.scss b/src/core/public/chrome/ui/header/collapsible_nav_group_enabled.scss
index 72c9245df56..c04d21131e5 100644
--- a/src/core/public/chrome/ui/header/collapsible_nav_group_enabled.scss
+++ b/src/core/public/chrome/ui/header/collapsible_nav_group_enabled.scss
@@ -106,6 +106,7 @@
       padding-top: $euiSizeM;
       padding-bottom: $euiSizeM;
       border-top: $euiBorderThin;
+      border-color: $euiColorMediumShade;
     }
   }