adds special class for on sale page plugin

/*

code snippet that adds special class for on sale page - thanks to Jonk
plugin url https://wordpress.org/plugins/on-sale-page-for-woocommerce/

*/
add_filter( 'body_class', 'wc_onsale_page_body_class' );

function wc_onsale_page_body_class( $classes ) {

    $get_queried_object_id = get_queried_object_id();
    $woocommerce_onsale_page_id = get_option( 'woocommerce_onsale_page_id' );

    if ( $get_queried_object_id == $woocommerce_onsale_page_id ) {
        $classes[] = 'sale-page';
    }
    return $classes;
}