In the starter kit, each page template (/site/templates) has a piece of code like this
<h1><?= $page->title()->html() ?></h1>
<div class="intro text">
<?= $page->year() ?>
wie a h1 element. Looks like you have removed the intro text but the horizontal line and. the heading are still there. So you would want to remove that line or maybe even the whole header tag.