html,body{width:100%;height:100%;}body{margin:0;padding:0;overflow:hidden;}#powerblocks-container{position:relative;width:100%;height:100%;background-color:#202020;}#powerblocks{display:block;position:absolute;background-color:#222;width:400px;height:700px;top:0;left:0;right:0;bottom:0;margin:auto;}