themes-wordpress/the-menu/patterns/404.php

<?php
/**
 * Title: A 404 page
 * Slug: the-menu/404
 * Inserter: no
 */

?>

<!-- wp:group {"layout":{"type":"constrained"}} -->
<div class="wp-block-group"><!-- wp:group {"align":"wide","style":{"spacing":{"padding":{"bottom":"40px","top":"64px"}}},"layout":{"type":"constrained"}} -->
<div class="wp-block-group alignwide" style="padding-top:64px;padding-bottom:40px"><!-- wp:spacer {"height":"40px"} -->
<div style="height:40px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer -->

<!-- wp:heading {"textAlign":"left","level":1,"align":"wide","anchor":"oops-that-page-can-t-be-found"} -->
<h1 class="wp-block-heading alignwide has-text-align-left"><?php echo esc_html__( 'We\'re sorry!', 'the-menu' ); ?></h1>
<!-- /wp:heading -->

<!-- wp:heading {"textAlign":"left","level":1,"align":"wide","anchor":"oops-that-page-can-t-be-found"} -->
<h1 class="wp-block-heading alignwide has-text-align-left"><?php echo esc_html__( 'Nothing has last...', 'the-menu' ); ?></h1>
<!-- /wp:heading -->

<!-- wp:spacer {"height":"40px"} -->
<div style="height:40px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer -->

<!-- wp:group {"align":"wide","style":{"spacing":{"blockGap":"40px"}},"layout":{"type":"constrained","justifyContent":"left"}} -->
<div class="wp-block-group alignwide"><!-- wp:paragraph -->
<p><?php echo esc_html__( 'We are apparently out of that item. What about a new selection?', 'the-menu' ); ?></p>
<!-- /wp:paragraph --></div>
<!-- /wp:group -->

<!-- wp:spacer {"height":"20px"} -->
<div style="height:20px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer -->

<!-- wp:group {"align":"full","layout":{"type":"constrained","justifyContent":"left"}} -->
<div class="wp-block-group alignfull"><!-- wp:search {"showLabel":false,"width":100,"widthUnit":"%","buttonText":"<?php echo esc_html__( 'Search', 'the-menu' ); ?>"} /-->

<!-- wp:spacer {"height":"40px"} -->
<div style="height:40px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer --></div>
<!-- /wp:group --></div>
<!-- /wp:group --></div>
<!-- /wp:group -->