Feature Proposal: Use prefers-color-scheme

[Freeplayg]

Is your feature request related to a problem? Please describe.
Sometimes I switch between light and dark mode on my desktop, and want the site to follow that

Describe the solution you'd like
Using prefers-color-scheme, preferably something similar to Misskey's theme switcher:

https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme
https://developer.mozilla.org/en-US/docs/Web/API/Window/matchMedia

[mayel]

Good idea, thing is we don't have just one dark and one light theme. Maybe we should have a user setting a preferred dark theme and a preferred light theme if the "sync / auto" option is on?

[mayel]

Maybe we should have a user setting a preferred dark theme and a preferred light theme if the "sync / auto" option is on?

Ah lol, just noticed that's what is done in the screenshot 👍

[mayel]

Done:
https://user-images.githubusercontent.com/115318/192189495-7892c6c6-123d-46b8-a5d3-6ede236bd98e.mov