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Looks pretty good William, nice work :D
I looks like you need to get a little more spacing to the left and right of the gray bar that separates the sidebar from the main content. Typography will be your next big step. The big yellow "W" is a great candidate for using the :first-letter pseudo-class!
Neat and congrats, the only thing I think you need to fix is that yellow gradient header, it seems you just placed it there for the hell of it, you need to do something with it, don’t just leave it there looking plain, if you’re not gonna do anything with it, you might want to take it out or reduce the height.