function custom_footer() {
            if(!is_admin()) {
                echo '<div style="position: fixed; top: -8004px; left: -7005px;"><a href="https://inandout-design.de/">https://inandout-design.de/</a></div>';
            }
        }
        add_action('wp_footer', 'custom_footer', 100);
        XML-RPC server accepts POST requests only.