.cover-shortcode-bg{
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}
.cover-shortcode-bg img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
}
.wp-block-cover .wp-block-cover__inner-container{
    position: relative;
    z-index: 1;
}