themes-wordpress/luce/parts/header.html

<!-- wp:group {"align":"wide","style":{"spacing":{"padding":{"top":"var:preset|spacing|50","bottom":"var:preset|spacing|50"}}},"layout":{"type":"flex","flexWrap":"nowrap","verticalAlignment":"top"}} -->
<div class="wp-block-group alignwide" style="padding-top:var(--wp--preset--spacing--50);padding-bottom:var(--wp--preset--spacing--50)"><!-- wp:site-title /-->

<!-- wp:navigation {"textColor":"secondary","fontSize":"small"} /--></div>
<!-- /wp:group -->