.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;
}.jarallax{position:relative;z-index:0}.jarallax>.jarallax-img{position:absolute;object-fit:cover;font-family:'object-fit: cover;';top:0;left:0;width:100%;height:100%;z-index:-1}