I'm not a webdev, and the fascination with yet-another-framework for JavaScript is really cute, but I really really REALLY don't get this. It's it appears to be nothing more than a CSS stylesheet. So what?
Have you ever written any CSS? This sort of framework just does the basics for you, it's the first 500 lines you'd otherwise have to write (and CSS can be quite painful to get right). It's not really just a stylesheet, it's a solid starting point meant to be expanded upon.