.ajax-loader-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: rgba(255,255,255, .8) url('/images/ajax_loader.gif') 50% 50% no-repeat;
}

body.loading .ajax-loader-modal {
    overflow: hidden;
}

body.loading .ajax-loader-modal {
    display: block;
}