#Popup
{
        visibility: hidden;
        position: absolute;
        left: 50%;
        top: 50%;
        background-color: #FFF;
        padding: 10px;
}

#Overlay
{
        visibility: hidden;
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        background-color: #000;
}