Force a lower z-index on the reactor bar to prevent bug when scrolling

css/redactor.css

@@ -327,7 +327,7 @@ body .redactor_box_fullscreen {
   background: #fff;
   border: none;
   box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
-  z-index: 1;
+  z-index: 1 !important;
 }
 .redactor_toolbar:after {
   content: "";