coptimize code

src/client/styles/scss/_layout_variable.scss

@@ -32,5 +32,4 @@ $grw-floral-white: floralwhite;
 // fix tab width to 95 pixels
 // see also '_on-edit.scss'
 $nav-main-left-tab-width: 95px;
-$nav-main-tab-height: 41px;
-$nav-main-tab-font-size: 14px;
+$nav-main-tab-height: 42px;