.site_center{
position: relative;
width:780px;
height: 720px;
text-align:center;
padding: 0 auto;
margin: 0 auto;
}
.main { 
position: relative;
width:780px;
height: 720px;
margin-left: auto;
margin-right: auto;
margin-top: 12px;
border: 1px solid white;
}