Merge pull request #6492 from cquah/issue-3986

CSS: Remove 'overflow: visible' property from '.p-DockPanel-tabBar' class.

packages/application/style/tabs.css

@@ -20,7 +20,6 @@
 
 .p-DockPanel-tabBar {
   border-bottom: var(--jp-border-width) solid var(--jp-border-color1);
-  overflow: visible;
   color: var(--jp-ui-font-color1);
   font-size: var(--jp-ui-font-size1);
 }