@media only screen and (max-width: 48em) { }
add_filter('woocommerce_loop_add_to_cart_link', function ($link) {
// If rel already exists, don't duplicate.
if (stripos($link, 'rel=') !== false) {
return $link;
}
// Add rel="nofollow" to reduce crawling of add-to-cart action links.
return preg_replace('/<a\s+/i', '<a rel="nofollow" ', $link, 1);
}, 10, 1);