.div-overlay {
    visibility: hidden;
    position: fixed;
    left: 500px;
    top: 100px;
    max-width: 600%;
    max-height: 650px;
    text-align: center;
    z-index: 1000;
}

.div-overlay1 {
    width: 100%;
    max-height: 100%;
    margin: 5px auto;    
    padding: 5px;
    text-align: center;
}

.iframe-postFrame {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}