if you want to see ideas, techniques etc for Tile, probably useful to checkup on these sources
https://community.home-assistant.io/t/mushroom-cards-build-a-beautiful-dashboard-easily in which @rhysb is doing an amazing job, do also find his guide for animated icons, it is so cool.
There is also this
Aware Mushroom is not Tile, but they are essentially the same and made by the same designer.
O, and please change the title of this topic to reflect it is your styling that does not work. Card-mod is not broken at all, and this title keeps pulling me in… 