Answer 1

There is a dark theme extension on chrome you can use it to turn everything on your browser dark

Answer 2

Bhavik Mahalle

No they don't have right now.

Answer 3

I couldn't find the dark mode default in SoloLearn web. But you can use 'Dark Reader' chrome extension (also available for firefox, edge and safari). It works fine with SoloLearn.

Answer 4

For Opera > Appearance > force dark theme in pages