Resources/views/layout.html.twig
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>{% block title 'Beelab user admin' %}</title>
<link rel="shortcut icon" href="{{ asset('favicon.ico') }}" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
{% block stylesheets %}
<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
{% endblock %}
</head>
<body>
<div class="container">
{% block body '' %}
</div>
{% block javascripts %}
<script src="//code.jquery.com/jquery-2.1.0.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
{% endblock %}
</body>
</html>