div.loader {
    display: none;
    position: fixed;
    z-index: 1003;
    width: 200px;
    height: 200px;
    opacity: 1.0;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
}

img.loader{
    width: 100%;
}

div.overlayBack {
    position: fixed;
    left: 0%;
    top: 0%;
    width: 100%;
    height: 100%;
    opacity: 0.8;
    z-index: 1000;
    background-color: #a8a7a3;
    display: none;
}