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/* Create Buy Now Button dynamically after Add To Cart button */
    function add_content_after_addtocart() {
    
        // get the current post/product ID
        $current_product_id = get_the_ID();
    
        // get the product based on the ID
        $product = wc_get_product( $current_product_id );
    
        // get the "Checkout Page" URL
        $checkout_url = WC()->cart->get_checkout_url();
    
        // run only on simple products
        if( $product->is_type( 'simple' ) ){
            echo '<a href="'.$checkout_url.'?add-to-cart='.$current_product_id.'" class="buy-now button">Buy Now</a>';
            //echo '<a href="'.$checkout_url.'" class="buy-now button">Buy Now</a>';
        }
    }
    add_action( 'woocommerce_after_add_to_cart_button', 'add_content_after_addtocart' );

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.woocommerce a.button{margin-left:10px;}
 .woocommerce button.button, .woocommerce input.button{margin-bottom:5px;}