Hello friends I just joined the codeforces system not long ago, I have some eye problems so I haven't done the exercises on a white background for a long time, I want to know if the codeforces system has dark mode, if so, what do I do to switch to that mode. Thanks very much.
Codeforces has no official dark theme. I usually use Dark Reader, which is an extension that works for all sites, but sometimes has slightly wrong colors. You can also try this userscript, but I haven't used it myself so I can't judge.