This library contains Bootstrap 4, the theme and jQuery for the RWTH Aachen pages. The library is provided in the form of a Node.js module.
If you want to customize the theme, the project must be cloned with git. Then just run
npm install npm run build
inside the project.
Then customize the theme via _rwth-styles.scss and rwth-theme.scss. The css files are automatically recompiled by gulp watch and injected into the browser.