While we are working on our own Dark Mode [1] styling in respect of yours and our own eye health, we recommend (and use) this browser extension:
And if you want a browser theme to match then these work well for us too:
Google Chrome: Material Simple Dark Grey
Firefox: Addons > Themes > Dark
Mac & Safari: Update to OS X Mojave and consider f.lux for removing blue-light at night.
Windows: Version 10 and later – Settings > Personalisation > Colours > Dark Mode
Footnotes & References
- aka Night Mode / Night Shift / Night Reader[↑]