Board Thread:Support Requests - Getting Technical/@comment-3279487-20170202121822/@comment-1757994-20170202163247

Basically you're asking if it's possible to apply a background color to a DOM element's margin. You can't. The margin is always transparent. That's just how HTML and CSS work.

If you want the effect of a colored margin, you have to wrap the element with another element and color the wrapper.