ดึงหน้าเว็บส่งไปพร้อมกับเมลล์ แต่ style css ไม่แสดงเลยครับ

<?PHP
	$to      = $email_customer;
	$subject = "Congratoration my customer.";
        $message = file_get_contents('http://www.site.com/test_page.php?number=1234567890');
        $headers  = 'MIME-Version: 1.0' . "\r\n"; 
        $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n"; 
        $headers .= "From:[email protected]\r\n"; 
        mail($to, $subject, $message, $headers);
?>

<link rel="stylesheet" href="http://www.site.com/style.css">
<div class="middle_left">
     Thank you for shopping na ka
</div>