MC-1408: PageBuilder HTML Content Block Renaming and Preview

Author: irenelagno

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

@@ -7,7 +7,7 @@
 //  Default appearance styles
 //  _____________________________________________
 
-.pagebuilder-content-type {
+.pagebuilder-content-type-wrapper {
 
     .pagebuilder-html {
         .placeholder-html-empty {