AngryHan

I'm fixing up my club website, and I've run into a problem with positioning. I've given each div section its own coloured border to help distinguish them. The blue box is supposed to be the sidebar. The yellow box is the main contents of that page. As you can see, it sits behind the sidebar. How can I make it so that the contents box starts where the sidebar box ends? The sidebar is floated to the left. I've tried various display: variables such as inline and block, but they don't fix the problem. Any suggestions please?