Revise header template part to give it some padding.

mayland-blocks/block-template-parts/header.html

@@ -1,7 +1,5 @@
-<!-- wp:spacer {"height":14} -->
-<div style="height:14px" aria-hidden="true" class="wp-block-spacer"></div>
-<!-- /wp:spacer -->
-
+<!-- wp:group {"align":"full","style":{"spacing":{"padding":{"top":"14px","right":"32px","left":"32px"}}}} -->
+<div class="wp-block-group alignfull" style="padding-top:14px;padding-right:32px;padding-left:32px;">
 <!-- wp:columns {"verticalAlignment":null, "align":"full"} -->
 <div class="wp-block-columns alignfull"><!-- wp:column {"verticalAlignment":"center"} -->
 <div class="wp-block-column is-vertically-aligned-center"><!-- wp:site-title /--></div>
@@ -24,4 +22,5 @@
 <!-- /wp:social-links -->
 <!-- /wp:navigation --></div>
 <!-- /wp:column --></div>
-<!-- /wp:columns -->
+<!-- /wp:columns --></div>
+<!-- /wp:group -->