Device (or user) dependent frontend configuration (e.g. font, font size, layout, etc.) recommendations

Yeah, I get confused with translating the generic CSS for use in card-mod, but that may be because I started with modifying Mushroom Cards’ CSS. Thanks for pointing me in the right direction!

Actually, @Ildar_Gabdullin before I start into this for my entire dashboard, is there a way to make a global change to font size (which I could then manipulate with a media query)? I know CSS is hierarchical and I’ve reviewed your examples here, but would I need to apply those to each.and.every.card or could I insert a card_mod statement at the top of an entire dashboard to alter all text in the dashboard?