Proton is a simple CSS framework for building web page prototypes. It is explicitly intended for basic prototyping, not for real websites.

Use this to put together a quick proof-of-concept or rough wireframe. The results will be rudimentarily functional but intentionally ugly.


  • Responsive, fluid, mobile-friendly grid system.
  • Uses plain (un-pre-processed) CSS.
  • Requires loads of presentational classes.
  • Encourages semantically meaningless container elements.
  • Little to no backwards compatibility with older browsers.
  • Zero performance optimization. Any percieved speed is accidental.
  • Everything lives in an ugly gray box.

This code is unshippable.

This project lives on Github.