You could use LESS or something similar, fork a repo like this one [1] and start adding your stuff. [1] https://github.com/anthonyvscode/Less-CSS3-Mixins https

You could use LESS or something similar, fork a repo like this one [1] and start adding your stuff. [1] https://github.com/anthonyvscode/Less-CSS3-Mixins https://github.com/anthonyvscode/Less-CSS3-Mixins