Card overlay with another card

I want to put additional information to a button card. I use this button card to show a picture-button and want to overlay a bar card showing the battery of a device for example. At the moment I have this to information stacked together, but not the way I want. The bar-card should be an overlay of the button card. Any suggestions how to do that? Even a different approach for the result would be helpful…

The picture elements card is used to overlay entities on top of a picture. Those elements can be clickable, so does your card really need to be a button card?

I use it for this, with lots of clickable things, overlays for open doors, …: