As part of our work for how customers can brand cPanel, we developed the cPanel Style Guide, a comprehensive list of how to style plugins to look more integrated with the cPanel interface. While it is based on Bootstrap, there are some minor changes and additions we are happy to ship with, such as FontAwesome icons.
The cPanel Style Guide gets incremental updates such as documentation changes, new layouts, and new features. It is still in development and we’re always looking for help to make it better. To tell us what you think, leave a comment on the user experience forums.