I have inserted a new screenshot.
Actually, there is a padding around the cards. If I set no background and border, this looks quite strange. I want the content of the cards on the same edge as the surrounding text and not the blank space around the content of the cards.
Actually it is possible to define a border color in the columns settings but I would like to define the border a bit more, eg. box shadow, and need to know how to address this.
