This project is open source and quite permissive. Please feel free to submit pull requests, report issues, or, if you have a totally different opinionated view of this project, fork it !
do you want to run your own dev instance ? for this, you need nodejs, npm and gulp.
on mac, please use homebrew to install nodejs, then brew install node.
If you are running Linux use your packet manager.
Windows users may have a look at this page.
npm is provided with nodejs, this should do the trick npm i -g gulp
npm install
please think about committing /css/default.min.css when you update a newer version