If you have applied a dark theme on your desktop, also in osm.org you should have it.
Before:
After:
- apply dark theme into header, sidebars, panels and leaflet elements
- apply partially the dark theme into iD editor
You need install the add-on or extension for your modern browser:
- Firefox GreaseMonkey,
- Opera ViolentMonkey, or
- Chrome/Chromium TamperMonkey
Click here, click on "Install Script" and wait for install
Reload osm.org and the script will start
- font size
- iD editor
Enjoy!
B^)