You can do that in CSS now. I've noticed surprisingly many sites adjusting when I started using a Windows machine and set my system-wide preference to dark mode.
Prolly cause the devs themselves use it
Yup I try to convert every product I develop lol
Would really love it if HackerNews got this... It's blinding when I browse it on my desktop monitor in the evenings.
Unfortunately their dark mode detection is incorrect on my computer :(