- Create a userstyle in Stylish named "Google Drive Dark Dev".
- Run generate-dev.pl to create a "google-drive-dark-dev.css" file.
- Copy the contents of "google-drive-dark-dev.css" into the "Google Drive Dark Dev" userstyle.
- Run parse.pl to generate "google-drive-dark-stylish.css" using "google-drive-dark-userstyles.css".