body {
	font-family: sans-serif;
	font-size: 10pt;
	margin: 0;
	background-color: beige;
}

#main {
    height: 200px;
    width: 400px;

    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -100px;
    margin-left: -200px;
}