Now that you have the YUI stylesheets in place, it's time to add a basic layout. A center-column layout with a narrow width is typical for a blog, so we'll use YUI's 750px center-column layout. To do this, enclose everything in your body in a div tag with the id doc. This div should surround your yield block and any other HTML you have in the body.
<div id="doc"> <%= yield %> </div>