Let's start this chapter with some modifications to the main layout. Edit the main layout located at modules/Backoffice/Views/Default/layout.volt and add the following code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{% block pageTitle %}Learning Phalcon{% endblock %}</title>
{{ assets.outputCss('headerCss') }}
{% block css %}{% endblock %}
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
{% include 'common/topbar.volt' %}
<div class="container-fluid">
<div class="row">
<div class="col-sm-3 col-md-2 sidebar">
{% include...