I use google experiments to force all web pages to dark mode. If you type Chrome://flags in your browser it takes you to a bunch of google chrome experimental features. search for dark mode and there are a few options to choose from. Its not perfect and it can make things look a little funky on some sites but it functions well enough. if you can handle photos looking weird and some hyperlinks becoming invisible essentially.
I use Dark Reader. I haven't found better results, though, I haven't tried Google's experimental features yet I'll have to give them a try.
