Make Card background transparent for custom icons in 4.10.03

[Mobius 18]

I have been using the old Emby for windows ver 3.0.20 with some custom icons.There was an issue where the card background shows (offputting to me), which I was able to remedy with the old winstyles.css.The card background was made transparent so all was good. It also allows the icons to be closer together so they all fit in a single row.Otherwise I end up with 2 rows, so bonus.

With the new MS store version 4.10.0.3 it's back to looking odd and my icons scroll to take up 2 rows. So I could use some help. 

Is there a CSS script I can put into the  'Server settings' of 4.10.0.3 that will give me the same appearance as with 3.0.20?

version 4.10.0.3 looks like this

I want it to look the way I had it in 3.0.20 which is this

Cheers in advance. :)