themes-wordpress/bitacora/patterns/hidden-404.php

<?php
/**
 * Title: Hidden 404
 * Slug: bitacora/hidden-404
 * Inserter: no
 */
?>
<!-- wp:heading {"level":1,"fontSize":"large"} -->
<h1 class="has-large-font-size" id="oops-that-page-can-t-be-found"><?php echo esc_html__( 'Oops! That page can&rsquo;t be found.', 'bitacora' ); ?></h1>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p><?php echo esc_html__( 'It looks like nothing was found at this location. Maybe try a search?', 'bitacora' ); ?></p>
<!-- /wp:paragraph -->