gdsx/WebRoot/pages/mytest/css/mycss.css

.black_overlay{
 display: none;
 position: absolute;
 top: 0%;
 left: 0%;
 width: 100%;
 height: 100%;
 background-color: black;
 z-index:1001;
 -moz-opacity: 0.8;
 opacity:.80;
 filter: alpha(opacity=80);
}
.white_content {
 /*display: none;*/
 position: absolute;
 top: 10%;
 left: 10%;
 width: 75%;
 height: 80%;
 border: 16px solid lightblue;
 background-color: white;
 z-index:1002;
 overflow: auto;
}
.white_content_small {
 display: none;
 position: absolute;
 top: 20%;
 left: 30%;
 width: 40%;
 height: 50%;
 border: 16px solid lightblue;
 background-color: white;
 z-index:1002;
 overflow: auto;
}