Show referral field value below order details

add_action('woocommerce_admin_order_data_after_order_details','add_referral_field_below_order_details',10,1);

function add_referral_field_below_order_details($order) {
    echo '<p>&nbsp;</p><p style="font-size:20px"><strong style="color:orange">' . esc_html__('Referral') . '</strong>:<span> '. esc_html($order->get_meta('Referral', true)) . '</span></p>';
}