.wp-block-cover .wp-block-cover__image-background {
    min-height: 160%;
    min-width: 100%;
    width: auto;
    height: auto;
}

@media (orientation: portrait) {

    .wp-block-cover .wp-block-cover__image-background {
        transform: translateY(-50%) !important;
        top: 50%;
    }
}