change shadow css

src/client/styles/scss/_subnav.scss

@@ -106,7 +106,7 @@ $easeInOutCubic: cubic-bezier(0.65, 0, 0.35, 1);
   z-index: $zindex-sticky - 5;
 
   .grw-subnav {
-    box-shadow: 0px 6px 6px 3px rgba(black, 0.15);
+    box-shadow: 0px 0px 6px 3px rgba(black, 0.15);
   }
 }