MC-5423: Scheduled Update slide out issues

- Resolve static failures

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/_page-builder.less

@@ -26,7 +26,7 @@
 .pagebuilder-stage-wrapper {
     -moz-transition: .35s ease-in-out;
     -webkit-transition: .35s ease-in-out;
-    background: #fff;
+    background: @color-white;
     position: relative;
     transition: .35s ease-in-out;
 
@@ -149,10 +149,10 @@
 .pagebuilder-stage {
     -moz-transition: margin-left .35s ease-in-out;
     -moz-user-select: none;
-    -webkit-transition: margin-left .35s ease-in-out;
-    -webkit-user-select: none;
     -ms-user-select: none;
     -o-user-select: none;
+    -webkit-transition: margin-left .35s ease-in-out;
+    -webkit-user-select: none;
     font-size: 0;
     margin-left: 170px;
     min-height: 200px;