add_shortcode('agenda_auto', function() {
    return '
    <div style="width: 100%; display: flex; justify-content: center; background: #fff;">
        <iframe src="https://www.nuage.ooo/wp-content/uploads/agenda-view.php" 
                style="width: 100%; max-width: 1200px; height: 1200px; border: none; overflow: hidden; margin: 0 auto;">
        </iframe>
    </div>';
});