Customization Question?

[tcon2010]

I'm trying to customize this app to run on an Amazon Fire tablet (hosted on a MacBook) for use as a dashboard by the pool to control all my Sonos Roams. I've taken inspiration from CarPlay and its Now Playing layout. I use Apple Music so as you'll see in my screenshot I have taken out A LOT of controls out as they don't work with Apple Music anyway. I just need the simple controls of Play/Paue, Skip/Reverse, and Volume.

The issues I can't figure out are:

1. Where do I edit the size of the Play/Paue, Skip/Reverse buttons? I need to make them larger.
2. How can I put Artist and Album on different lines?
3. If possible, how can I make the current album art the background?

I know this is a very "hackie" setup so what I'm wanting to do may not be easily possible. I can manage my way around html & css, but beyond that I don't know much coding.

Note: I still have some position adjustments to make, so no, everything is not in it's final spot.