Merge pull request #1595 from Arhell/fix-nav

fix navigation on tablet

Author: chiedo

stylesheets/nav.scss

@@ -22,7 +22,7 @@ header summary,
 }
 
 .nav-mobile-dropdown {
-  @media (max-width: $width-md) {
+  @media (max-width: $width-md - 1) {
     display: none;
     visibility: hidden;
   }