For me its too much of a pain to do UI/UX but I believe the devs at Ycombinator know better and give us a dark themed UI. It is 2022 and I don't want to bleach my eyes every time I open HackerNews
If you use Firefox, HN Enhance may help. <a href="https://addons.mozilla.org/en-US/firefox/search/?q=HN%20enhance" rel="nofollow">https://addons.mozilla.org/en-US/firefox/search/?q=HN%20enha...</a>