The website is absolutely atrocious, dark mode has pitch-black background with bold 100% white glowing text in foreground, shitty font, way to wide text.
Seriously how is lwn.net even still so popular with such an atrocious unreadable ugly website. Well yes I get the irony of asking that on HN (I use an extension to make it better).
They have a settings page where you can set the colours you like… Most people who don't like them just change them to something they like.