Something like that?
Code:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>About Sigil</title>
<link href="../Styles/styles.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<p>...</p>
.........
</body>
</html>
Bold is mine.