.fblbCenterOuter {
position: fixed;
display: block;
top: 50%;
height: auto;
overflow: visible;
}  .fblbCenterOuter.fblbFixed {
position: fixed;
display: block;
top: 0;
height: auto;
overflow: visible;
}
.fblbFixed .fblbCenterInner {
margin-top: 0;
}