Merge "[fix] [Visual Editor] [LESS] [content] create stacking context differently"

resources/skins.minerva.base.styles/common.less

@@ -47,7 +47,9 @@
 }
 
 .content {
-	// Create a new stacking context.
-	transform: scaleY( 1 );
+	// Create a new stacking context. `transform: translateZ( 0 );` would be preferred but that
+	// triggers a browser bug which affects the edit cards in Visual Editor:
+	// https://bugs.chromium.org/p/chromium/issues/detail?id=20574
+	position: relative;
 	z-index: @z-indexBase;
 }