Putting the style sheet in a separate file

type="text/css" is not xsl

<!DOCTYPE html PUBLIC 
"-//W3C//DTD HTML 4.01//EN">
<html>
 <head>
   <title>My first styled page</title>
   <link rel="stylesheet" 
type="text/css"
href="mystyle.css">
</head> <body> ../..

Source : http://www.w3.org/Style/Examples/011/firstcss