themes-wordpress/ibis/block-template-parts/header.html

<!-- wp:group {"align":"full","backgroundColor":"background"} -->
<div class="wp-block-group alignfull has-background-background-color has-background"><div class="wp-block-group__inner-container"><!-- wp:spacer {"height":20} -->
<div style="height:20px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer -->

<!-- wp:columns {"align":"wide"} -->
<div class="wp-block-columns alignwide"><!-- wp:column {"width":33.33} -->
<div class="wp-block-column" style="flex-basis:33.33%"><!-- wp:site-title {"style":{"typography":{"fontSize":32}}} /--></div>
<!-- /wp:column -->

<!-- wp:column {"width":66.66} -->
<div class="wp-block-column" style="flex-basis:66.66%"><!-- wp:navigation {"orientation":"horizontal","itemsJustification":"right"} -->
<!-- wp:navigation-link {"label":"Home","url":"http://home"} /-->
<!-- /wp:navigation --></div>
<!-- /wp:column --></div>
<!-- /wp:columns --></div></div>
<!-- /wp:group -->