Created by: LaurentGoderre
This allows implementers to override all font sizes without the need to recompile and still be able to use the code from CDN. Implementers only need to add body{font-size:...} to their style sheets.
This also allows implementers that need to conform to WCAG 2.0 to comply with the previous line of code (it is a failure of WCAG 2.0 to use absolute units such as pixels).