#pjax_progress {
    position: fixed;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    background: rgba(255, 255, 255, .95);
    z-index: 3;
    display: none;
}

#pjax_progress .image {
    position: absolute;
    top: 50vh;
    right: 0;
    left: 0;
    z-index: 4;

    background-image: url("../images/loading.gif");
    background-size: contain;
    background-repeat: no-repeat;
    width: 100px;
    height: 100px;
    margin: 0 auto;
}