themes-wordpress/heiwa/templates/header-footer-only.html

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

<!-- wp:group {"tagName":"main","style":{"spacing":{"margin":{"top":"0px","bottom":"0px"}}},"lock":{"move":false,"remove":true}} -->
<main class="wp-block-group" style="margin-top:0px;margin-bottom:0px"><!-- wp:post-content {"layout":{"inherit":true},"lock":{"move":false,"remove":true}} /--></main>
<!-- /wp:group -->

<!-- wp:template-part {"slug":"footer","tagName":"footer","className":"site-footer-container"} /-->