fix annotation exception when publishing poll while presentation swapped (chrome)

bigbluebutton-html5/imports/ui/components/media/styles.scss

@@ -66,15 +66,7 @@ $after-content-order: 3;
 }
 
 .hideOverlay {
-  visibility: hidden !important;
   position: absolute !important;
-  overflow: hidden !important;
-  clip: rect(0 0 0 0) !important;
-  width: 1px !important;
-  height: 1px !important;
-  margin: -1px !important;
-  padding: 0 !important;
-  border: 0 !important;
 }
 
 .floatingOverlay {