It looks like you want your white box post thing to be pink? (Grey in dark mode.)

You might want to first try to simplify - turn off the dashed outline style, etc.

Get the background to the colour you want, then add things on, like rounded corners, etc. and see what breaks.

When you find a glitch report it to M7 D3.

I learned by trial and LOOOOOOOOOOOOOOOOTS of errors. Sadly, sometimes there is just no solution to be had.