It's possible that the image you put in your post got changed. The forum sometimes makes images smaller. The one in your post is 620px wide. Applying that to the HTML element, adding a color to extend the image to the edges of the page, and using a transparent body (all like in the Yahoo example) and then adding a container div for the content of the page (probably like the Yahoo example). You would have this:
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
margin: 0 auto;
Your Page's Content goes here.
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