Firefox-CSS: border-radius issue for pseudo-element “before”
问题 I have a card-element (bootstrap-4) with a front and back, on hover the back side is shown. In order to create a "folded corner effect" I am using a pseudo-element(:before) on the front card, which works fine for all browsers except of firefox. The bottom-left corner of the pseudo-element should also be rounded, so I set a border-radius. Unfortunately in Firefox the corner is not rounded, instead there is a strange box shown in the pseudo-element. Any ideas what is causing this issue in