Use Kompozer with CSS to adjust layout

We have previously used this 2 column layout to learn how to adjust formatting using CSS.  We are now going to use it to learn how to adjust the layout of the web page.

1. Download the source code of the page. Remember how the CSS is at the top?
2. The central section is 750 pixels wide. We can tell this by looking at this code:
   #wrap {
   width:750px;
   margin:0 auto;
   background:#99c;
   }