<?xml-stylesheet type="text/xsl" href="yourxsl.xsl"?>
/*Add a link to your CSS file:*/
<xsl:template match="/">
<html>
<head>
<link rel="stylesheet" href="path/to/your/css/file.css">
</head>
<body>
<xsl:apply-templates select="Book"/>
</body>
</html>
</xsl:template>