themes-wordpress/organizer/templates/404.html

<!-- wp:template-part {"slug":"header","tagName":"header"} /-->

<!-- wp:group {"style":{"spacing":{"blockGap":"0px"}},"layout":{"type":"constrained"}} -->
<div class="wp-block-group">

<!-- wp:pattern {"slug":"organizer/404"} /-->

<!-- wp:template-part {"slug":"footer","tagName":"footer","align":"full"} /--></div>
<!-- /wp:group -->