Is... is that? Is that CSS?! Congrats Dave!

How much do you understand it? If you think you've got an okay grasp on it, I want you to toss the CSS in the trash, and recode it trying to get the same look, or close to it. I'm not saying the CSS is bad by any means, but if there's one way to learn CSS, it's by coding the same site over again. You won't remember exactly how you did it last, and it'll force you to work with the different properties a lot to get it x-browser.