Ugh, I really want to support dark mode (it’s a big accessibility win!) but right now my stylesheets are such a mess and Isso does a couple of aggravating things that makes it hard to correctly do dark mode themes. Namely that it provides its own inline stylesheet that is difficult to override correctly (without just throwing the whole thing out and remaking it from the ground up).
I wish more things used CSS variables by default – they’re very well-supported now and make it a lot easier to reason around themes. One of these days I’m going to get around to redoing all my stylesheets and use them for all colors and probably for most of my sizing.