phpengine/ui/masterpage.tpl

<!DOCTYPE html>
<html lang="it">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
	<title>{{@SITENAME}}</title>
	<link type="text/css" rel="stylesheet" href="{{@BASEURL}}/bundle.css"/>

	<script type="text/javascript">
    var BASEURL = '{{@BASEURL}}';
	</script>
</head>
<body>

<include href="header.tpl"/>

<div class="d-flex px-0 justify-content-around" style="height: calc(100% - 150px); overflow: auto">
	<include if="{{ isset(@CONTENT) }}" href="{{@CONTENT}}"/>
</div>

<include href="footer.tpl"/>

<script src="{{@BASEURL}}/bundle.js"></script>

</body>
</html>