#overlay {
    position: absolute;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100%;
    background-color: #000000;
    opacity: .7;
    z-index: 9999;
}

#binder {
    position: absolute;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    width: 90%;
    height: 90%;
    z-index: 10000;
}