You dont't need a white bg for it to work as far as I know, I used almost the exact same code in @zandik, with a black bg.

I still don't quite get what do you mean by glowing border... Is it the double-line separating the question from the answer? If so, I used this code for it: .card-nest .card:first-child { border: double #616f9255; border-width: 0 0 5px 0 !important }