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>

<div class="container-fluid h-100">
    <include if="{{ isset(@CONTENT) }}" href="{{@CONTENT}}"/>
</div>

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

</body>
</html>