MC-876: Pagebuilder - Tabs Advanced Border Displays Differently On Stage & Storefront

Author: omiroshnichenko

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/tabs/_default.less

@@ -113,6 +113,7 @@
 
             &.ui-state-active {
                 background: @color-white;
+                z-index: 19;
 
                 &:after {
                     border-bottom: 1px solid @color-white;

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/text/_default.less

@@ -22,6 +22,7 @@
             left: -2px !important;
             right: -2px;
             top: -1px !important;
+            z-index: 20;
         }
         .placeholder-text {
             left: 5px;

app/code/Magento/PageBuilder/view/frontend/web/css/source/content-type/tabs/_default.less

@@ -26,7 +26,7 @@ div[data-role='tabs'] {
         li.tab-header {
             background: @f6;
             border: 1px solid @ccc;
-            border-bottom: 0 !important;
+            border-bottom: 0;
             border-bottom-left-radius: 0 !important;
             border-bottom-right-radius: 0 !important;
             display: inline-block;