.slot.position1x1.size2x2 {width:310px; height:310px; left:0px; top:0px;}
.slot.position3x1.size2x1 {width:310px; height:145px; left:0px; top:330px;}
.slot.position4x1.size2x1 {width:310px; height:145px; left:0px; top:495px;}
.grid {position:relative; width:310px; height:660px;}