I thought I would ask here, maybe raise awareness of such solutions in the process.
For those who don’t know: websites use HTML, CSS and JS. The code is downloaded from the server, but it is interpreted by the browser, locally on your device. So there is no problem to modify this code for yourself ;)
There are ready solutions for this, I use Stylus + UserStyles.world.
Specifically, these two CSS, without which I can’t imagine using NextDNS.io and DeepL.com:
Dark mode everything. No special styles needed.
I usually leave the lights off and light modes are way too bright.
I like the ones I provided because they are not just for “dark mode” - You can choose any color you want.
I, for example, on my phone have black, but on my computer other colors - because in this context black is too dark ;)