Correction: below is a more accurate XHTML example of creating the effect shown in the video:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Katies Homepage</title>
</head>
<body style="background: url(bluescky.jpg); color: white"> <h1>Hello world</h1> <h2>This is Katie's Homepage</h2> </body>
</html>