silverstripe-cms/templates/Includes/CMSSettingsController_EditForm.ss

<form $FormAttributes>

	<% if Message %>
	<p id="{$FormName}_error" class="message $MessageType">$Message</p>
	<% else %>
	<p id="{$FormName}_error" class="message $MessageType" style="display: none"></p>
	<% end_if %>

	<fieldset>
		<% if Legend %><legend>$Legend</legend><% end_if %>
		<% loop Fields %>
			$FieldHolder
		<% end_loop %>
		<div class="clear"><!-- --></div>
	</fieldset>

	<% if Actions %>
	<div class="Actions">
		<% loop Actions %>
			$Field
		<% end_loop %>
		<% if Controller.LinkPreview %>
			<a href="$Controller.LinkPreview" class="cms-preview-toggle-link ss-ui-button" data-icon="preview">
				<% _t('LeftAndMain.PreviewButton', 'Preview') %> &raquo;
			</a>
		<% end_if %>
	</div>
	<% end_if %>
</form>