address doublescroll #3028 (#3035)

* quick fix for mobile menu button overlap

* - use new dynamic vh css prop to handle ios safari double scrolling
- only force tabs height when online

* cleanup

* add comment

web/styles/ant-overrides.scss

@@ -162,7 +162,6 @@ DROPDOWN
     height: 100%;
   }
   .ant-tabs-content {
-    height: 100% !important;
     overflow: auto;
     .ant-tabs-tabpane-active {
       height: 100%;