body {
    height: 100%;
}
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    opacity: 0;
    filter: alpha(opacity=0);
    z-index: 50;
    cursor: pointer;
}
.box {
    position: absolute;
    opacity: 0;
    filter: alpha(opacity=0);
    left: -9999em;
    z-index: 51;
}