.center{
position: fixed;
top: 0px;
left: 0px;
right: 0px;
width: 200px;
height: 200px;
margin:0 auto;
}
.center{
position: fixed;
top: 0px;
left: 0px;
right: 0px;
width: 200px;
height: 200px;
margin:0 auto;
}