.jarallax {

    position: relative;

    z-index: 0;

}

.jarallax > .jarallax-img {

    position: absolute;

    object-fit: cover;

    /* support for plugin https://github.com/bfred-it/object-fit-images */

    font-family: 'object-fit: cover;';

    top: 0;

    left: 0;

    width: 100%;

    height: 100%;

    z-index: -1;

}