silverstripe-reports/templates/Includes/ReportAdmin_Content.ss

<div class="cms-content center $BaseCSSClasses" data-layout-type="border">

	<div class="cms-content-header north">
		<h2><% _t('REPORTS','Reports') %></h2>
	</div>

	$Tools

	<div class="cms-content-fields center ui-widget-content">
		$EditForm
	</div>
	
</div>