.modal_bg{
    position:absolute;
    display:none;
    z-index:1000;
    left:0;
    top:0;
    background-color:#A8A8A8;
  }
  .modal_window{
    position:absolute;
    display:none;
    left:50%;
    z-index:1100;
    width:600px;
    margin-left:-300px;
    height:600px;
    background:#ffffff;
  }

.selector {

}