Stylish theme to darken all sites that doesn't suck. All syntax highlighting is kept while being dead simple.
Stylus/Stylish theme.
The script is not required, but recommended. It's a tiny one liner used to realize if we're in an iframe or not. Without the script active, iframes will not be darkened.
Style (theme.user.css): https://userstyles.org/styles/137141/the-darkening
When using Stylish, optional script to also blacken iframes: (theme.js): https://greasyfork.org/en/scripts/26202-the-darkening
Also, you may want to look into switching to the fork, it's quite better already and doesn't have the same politics getting
features into Stylish does.
This:
