.pif-has-gallery {
    position: relative;
}

.pif-has-gallery .onsale {
    z-index: 999999;
}

.pif-has-gallery .wp-post-image {
    opacity: 1;
}

.pif-has-gallery .wp-post-image--secondary {
    inset: 0 auto auto 0;
    opacity: 0;
    position: absolute;
}

@media (hover: hover) and (pointer: fine) {
    ul.products li.pif-has-gallery a.woocommerce-LoopProduct-link [class*="wp-post-image"],
    ul.products li.pif-has-gallery a.woocommerce-loop-product__link [class*="wp-post-image"] {
        transition: opacity 0.5s ease;
    }

    ul.products li.pif-has-gallery a.woocommerce-LoopProduct-link:hover .wp-post-image,
    ul.products li.pif-has-gallery a.woocommerce-loop-product__link:hover .wp-post-image {
        opacity: 0;
    }

    ul.products li.pif-has-gallery a.woocommerce-LoopProduct-link:hover .wp-post-image--secondary,
    ul.products li.pif-has-gallery a.woocommerce-loop-product__link:hover .wp-post-image--secondary {
        opacity: 1;
    }
}