It also won’t work because the code is for the custom:mini-media-player and the OP is using the standard media player.
Thank you for pointing this out. I accidentally deleted “card_mod:” when I was editing the part after “entity:” I also forgot to remove “.player: null” after I was done testing it.
Your post was the first place I checked but none of your examples on your Styling stock Media player card post are for resizing the card. Your examples are only for coloring it unless I missed something. I tried to do the best I could but I’m sure you probably have a more efficient way of styling the size of the elements inside of the card. I always get stuck when it comes to text/icons that are in a flex box inside of a column and extend outside of the card. I don’t know enough about CSS to understand why that’s done and the correct way to handle it.