 href="{{ base_url }}/css/highlight.css">
    {%- for path in extra_css %}
    <link href="{{ path }}" rel="stylesheet">
    {%- endfor %}
  {%- endblock %}

  {%- block libs %}
    <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!--[if lt IE 9]>
        <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
        <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
    <![endif]-->

    <script src="{{ base_u