body {
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
#main_area {
position:absolute;
width:760px;
height:410px;
left:50%;
top:50%;
margin-left:-380px;
margin-top:-205px;
background:#fff;
color:#999;
}