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src/client/styles/scss/_layout.scss

@@ -54,11 +54,13 @@
     top: calc(50vh - 20px);
   }
 
+  // override @atlaskit/navigation-next styles
   div[class$='-NavigationContainer'] {
     // Adjust to be on top of the growi subnavigation
     z-index: $zindex-sticky + 5;
   }
 
+  // override @atlaskit/navigation-next styles
   div[class$='-Outer'] {
     div[class$='-Shadow'] {
       background: unset;