If you're not okay with extensions then use Opera which has night mode as a built in feature and for God's sake today only I noticed it very good to use than other dark modes which I used in the past to filter blue and not harming my eyes. Dark mode in Opera is giving good details than others and also you have settings to dim the brightness of the keyboard as well in case if you're a mobile user.

That's it for now and I will add more if I found anything interesting.

P.S I am writting this in dark mode on Opera browser.