themes-wordpress/perenne/templates/404.html

<!-- wp:group {"style":{"spacing":{"blockGap":"0px","margin":{"top":"var:preset|spacing|80","bottom":"var:preset|spacing|80"}}},"layout":{"type":"constrained"}} -->
<div class="wp-block-group" style="margin-top:var(--wp--preset--spacing--80);margin-bottom:var(--wp--preset--spacing--80)">
	<!-- wp:site-logo {"width":24,"shouldSyncIcon":true,"className":"is-style-rounded","style":{"color":{},"spacing":{"margin":{"bottom":"32px"}}}} /-->

	<!-- wp:group {"layout":{"type":"flex","flexWrap":"nowrap","verticalAlignment":"center"}} -->
	<div class="wp-block-group">
		<!-- wp:pattern {"slug":"perenne/404"} /-->
	</div>
	<!-- /wp:group -->

	<!-- wp:pattern {"slug":"perenne/footer"} /-->
</div>
<!-- /wp:group -->