Memex : WordPress theme for archival documentation
Based on _s, or underscores.
Licensed under GPLv2 or later.
This theme uses a CSS build process using GULP. The setup is stored in gulpfile.js.
The CSS files are stored in: assets/source/stylesheets and during the build process, they are compiled and written into: assets/build/stylesheets/style.css
The following process was applied: https://github.com/wpromandie/wp-lausanne-2018-css/blob/master/docs/installation.md
You will find some technical documentation in the /docs/ folder (CSS structure, etc).