File: /home/nhathuocat/public_html/wp-content/themes/flatsome/woocommerce/single-product/price.php
<?php
/**
 * Single Product Price, including microdata for SEO
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/single-product/price.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see     https://docs.woocommerce.com/document/template-structure/
 * @author  WooThemes
 * @package WooCommerce/Templates
 * @version 3.0.0
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}
global $product;
$classes = array();
if($product->is_on_sale()) $classes[] = 'price-on-sale';
if(!$product->is_in_stock()) $classes[] = 'price-not-in-stock'; ?>
<div class="price-wrapper">
	<p class="price product-page-price <?php echo implode(' ', $classes); ?>">
  <?php echo $product->get_price_html(); ?></p>
</div>