div#overlay {
    position: fixed;
    z-index:999;
    top:0;
    left:0;
    width: 100%;
    height: 100%;
    background:white;
    pointer-events:none; 

    opacity : 1;
    transition: opacity 1s ease-in-out;
   -moz-transition: opacity 1s ease-in-out;
   -webkit-transition: opacity 1s ease-in-out;
}