themes-wordpress/ici/patterns/404.php

<?php
/**
 * Title: A 404 page
 * Slug: ici/404
 * Inserter: no
 */
?>

<!-- wp:heading {"level":1,"fontSize":"x-small"} -->
<h1 class="wp-block-heading has-x-small-font-size"><?php echo esc_html__( 'Oops, this page cannot be found.', 'ici' ); ?></h1>
<!-- /wp:heading -->

<!-- wp:search {"label":"<?php esc_attr_e( 'Search', 'ici' ); ?>","showLabel":false,"buttonText":"<?php esc_attr_e( 'Search', 'ici' ); ?>","buttonPosition":"button-inside","style":{"border":{"style":"solid"}},"borderColor":"var(--wp--preset--color--primary)","fontSize":"x-small"} /-->