🔹 Card-mod - Add css styles to any lovelace card

I try to apply some custom style to the title area of a (entities) card. Unfortunately this isn´t working, all style changes are “only” applied to the card below the title area.

How to modify a card´s title? Basically I just want to center a cards title instead of having it aligned left.

Do I need to fake a title somehow to modify it or is there another, more easy way?