.wait {
    display: none;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 999;
    background: rgba(255,255,255,0.8) url("/assets/images/loading.gif") center no-repeat;
    background-size: 70px;
}
/* Turn off scrollbar when body element has the loading class */
body.loading {
    overflow: hidden;
}
    /* Make spinner image visible when body element has the loading class */
    body.loading .wait {
        display: block;
    }