Mobile-first CSS (with SASS)

Feel free to use this as a starter to get you on the right track with writing mobile-first styles with SASS.

The rules:

1. Start with just the styles you need for mobile
2. Find natural min-width breakpoints to suit your design
3. Put all the media queries in the top-level .sass or .less file
4. Progressively add partials for larger screens as required

For a full explanation see this article on Medium