.close { text-decoration: underline }
#overlay {
     visibility: hidden;
     position: fixed;
     left: 0;
     top: 0;
     width: 100%;
     height: 100%;
     text-align:center;
     z-index: 200;
     background-image:url(maskBG.png);
    background-color: black;
    opacity:0.9;
}

#overlay div {
     width:300px;
     margin: 100px auto;
     background-color: #fff;
     border:1px solid #000;
     padding:15px;
     text-align:center;
}