With some tweaks you can make CoSo look how you want. There are bigger fish to fry than coding a theme switcher right now.
CoSo eventually will have this option but for now check out the userguide for themes.
https://help.counter.social/en/latest/accessibility.html#light-dark-mode
@MrGoat I went with a simple friends, notifications, firehose. Does what I need. Also the dark mode is nice, but I'd prefer even darker. Give me Midnight (amoled)!
@FernLovebond We can go all out and start resizing objects too to a point. @SentinelOfTruth