Velocity Reviews - Why is the border on top much wider

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs"
Inherits="Default2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
Hello!

<head runat="server">
<title></title>
<style type="text/css">
div
{
background-color:Red;
border:10px solid black;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>

<h1>h1 Text</h1>
</div>
</form>
</body>
</html>

//Tony