.center {
position: absolute;
top: 50%; left: 50%;
-ms-transform: translate(-50%,-50%);
-moz-transform: translate(-50%,-50%);
-o-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);
}
.center {
position: absolute;
top: 50%; left: 50%;
-ms-transform: translate(-50%,-50%);
-moz-transform: translate(-50%,-50%);
-o-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);
}