#wrapper {
    position:absolute;
    width:100%;
    height:100%;
    top:0;
    left:0;
    z-index:2;
}
#light {
    width:100%;
    height:100%;
    background-image:url(../images/overlay.gif);
    vertical-align:middle;
}
#box {
    width:340px;
    height:220px;
    background-color:white;
    margin:0 auto;
}