/* Z-index of #mask must lower than #boxes .window */
#mask {
  position:absolute;
  top: 0px;
  left: 0px;
  z-index:1;
  display:none;
}
  
.modal-window {
 position:absolute;
 width:440px;
 height:200px;
 display:none;
 z-index: 2;
 padding:20px;
 overflow: auto;

 -moz-box-shadow: 0px 0px 30px #000;
 -webkit-box-shadow: 0px 0px 30px #000;

 background: #fff;
 color: #000;
}