Hello, I have a problem with this code snippet, but only in Firefox. Chrome and IE work fine. I've already mentioned the problem in another thread, but I think that's a different topic and area, so i'll start this new thread. Unfortunately I cannot present a "normal" minimal demo, but i've created a codepen to illustrate the problem: https://codepen.io/design4u-koeln/full/xxyXOaO It's about the two areas with those gray bootstrap cards.   CSS: .karteien, .karteien2 { height: