StyleBuilder is a tool to help web teams develop and codify design and code standards. It's basically a live code editor combined with a HTML and CSS interface library that lets users keep their projects organized and evolve their practices over time.
The logo for StyleBuilder is animated and created entirely in HTML and CSS. I'm sure this wasn't implemented in the most efficient way possible and CSS logos are not really the right way to go in general, but it was a fun exercise.
Hover over the logo to see the magic!