“Sold out” badge on shop pages

<?php

add_action(
	'woocommerce_before_shop_loop_item_title',
	static function () {
		global $product;
		if ( $product instanceof WC_Product && ! $product->is_in_stock() ) {
			echo '<span class="snipfire-soldout">' . esc_html__( 'Sold out', 'woocommerce' ) . '</span>';
		}
	},
	9
);
add_action(
	'wp_head',
	static function () {
		echo '<style>.woocommerce ul.products li.product{position:relative}.snipfire-soldout{position:absolute;top:8px;left:8px;z-index:2;background:#1d2327;color:#fff;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;padding:4px 8px;border-radius:3px}</style>';
	}
);