User-1613068806 posted
After a long time dealing with that particular problem...I find a very simple solution just check it out...
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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">
<head runat="server">
<title>Untitled Page</title>
<style type="text/css">
#form1
{
width: 800px;
margin: 0px auto 0px auto;
}
</style>
</head>
<body>
<form id="form1" runat="server"
style="background-color: #000000; height: 361px;">
</form>
</body>
</html>