Add a11y class for top-level shortcut for Screen Readers

app/assets/stylesheets/framework/common.scss

@@ -376,3 +376,20 @@ table {
 }
 
 .hide-bottom-border { border-bottom: none !important; }
+
+.gl-accessibility {
+
+   &:focus {
+     top: 1px;
+     left: 1px;
+     width: auto;
+     height: 100%;
+     line-height: 50px;
+     padding: 0 10px;
+     clip: auto;
+     text-decoration: none;
+     color: $gl-title-color;
+     background: $gray-light;
+     z-index: 1;
+   }
+}