Mini media player idle / paused view question

Hello everybody,

I am using the mini media player card in my Lovelace dashboard for my Sonos speakers.

Also I am using the really great theme from Matt as a base.

It works just fine but there is one thing that really bothers me:

When the player is playing anything (i.e. a song from Spotify), the player shows the album cover and is using the full size of the tile (or area) just as it should be. But when nothing is playing, the mini-media-player card of course has no cover to show and changes its size. Is there any way to prevent it from changing its size? I.e. showing a placeholder cover image?

I tried working with the idle_view and background options from mini-media-player and also tried using a conditional card, but nothing did the trick.

Google bard and chatgpt didn’t help either.

Would be really great if anybody of you guys could come up with an idea to eat me in the right direction.

Thank you very much in advance!

Have you ever found a solution to this problem?