Merge branch 'csso-alternative' of github.com:magento/magento2-page-builder into 558_extending-mftf-tests

Author: omiroshnichenko

app/code/Magento/PageBuilder/view/adminhtml/web/template/content-type/column-group/default/master.html

@@ -6,6 +6,7 @@
 -->
 
 <div class="pagebuilder-column-group"
-     attr="data.main.attributes">
+     attr="data.main.attributes"
+     style="display: flex;">
     <render args="masterTemplate"/>
 </div>

app/code/Magento/PageBuilder/view/base/layout/default.xml

@@ -3,16 +3,6 @@
 //  * See COPYING.txt for license details.
 //  */
 
-//
-//  Column group styles
-//  _____________________________________________
-
-& when (@media-common = true) {
-    .pagebuilder-column-group {
-        display: flex;
-    }
-}
-
 //
 //  Mobile (style-m.css)
 //  _____________________________________________