In the beanstalk_inter ior.css file, you'll need to simplify the body {} rule to look like this:

Code:
body {
	background-color: #FFFFFF;
	padding: 0;
}
The margin and width you had before were screwing things up.

Then in your index.html file's <style> section, REMOVE this block, as it's not needed:

Code:
body {
	text-align: center;
	}
Also...