#overlay{
    /* display: none; */
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 999;
    background: rgba(255,255,255,0.8) url("./loading.gif") center no-repeat;
}
#display_body{
    text-align: center;
}
/* Turn off scrollbar when body element has the loading class */
#display_body.loading{
    overflow: hidden;   
}
/* Make spinner image visible when body element has the loading class */
/* #display_body.loading .overlay{
    display: block;
} */