- You make a new folder in themes directory
- You make a file called "config.json" with something like
{ "parentTheme": "dark", "stylesheets": ["style.css"] }
(replace "dark" with name of the theme you are using, if needed) - You make a file called "style.css" and paste CSS from my original replace in there
- Upon restarting GMEdit your theme will show up on the list in Preferences.