As per popular request, I made a dark version of the current CSS on bitcointalk(I'll do the mobile CSS too if there's interest).
If you have any ideas or suggestions, I'd be happy to tweak and improve the current design.
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Code here.

If you are using Brave or any other chrome based browser you can do one small trick to enable dark theme
without installing any script or extension.

How to do it?
- Simply enter this in your browser address bar and Enable Force Dark Mode for Web Contents:

chrome://flags/#enable-force-dark

There is several options to choose and experiment with, and you can always return to Default option.