magento2/magento2-page-builder#636: Responsive breakpoint switcher

Author: omiroshnichenko

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/_buttons.less

@@ -10,7 +10,7 @@
 @pagebuilder-button__margin: 0 10px 10px 0;
 @pagebuilder-button__font-size: 18px;
 @pagebuilder-button__line-height: @pagebuilder-button__font-size + 4;
-@color-pagebuilder-switcher-light-gray: #4a4542
+@color-pagebuilder-switcher-light-gray: #4a4542;
 
 .pagebuilder-button-primary {
     .lib-link-as-button();