https://github.com/Workable/css-style-guide
https://cssguidelin.es/
https://github.com/dropbox/css-style-guide
https://github.com/airbnb/css
http://codeguide.co/
https://github.com/gilbox/css-bliss
https://sass-guidelin.es/
https://github.com/trello/trellisheets
https://github.com/mvcss
https://www.yelp.com/styleguide