.main{
 width:800px;
 margin-left:auto;
 margin-right:auto;
}

.snapshot { 
 width: 400px; 
 height: auto; 
 display: block;
 margin-left: auto;
 margin-right: auto;
}

.wide { 
 width: 800px; 
}

.graphics { width: 400px; }