.overlay {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#loading {
    background: url("../images/spinner.gif") no-repeat center center;
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background-color: rgba(0,0,0,0.1);
    z-index: 9999999;
}