nav.html

{% for nav_item in nav %}
    <li class="toctree-l1{% if nav_item.active %} current{% endif %}">
        <a class="reference internal{% if nav_item.active %} current{% endif %}"{% if nav_item.active %} state="open"{% endif %} href="{{ nav_item.url }}">{{ nav_item.title }}</a>
        {% if nav_item.children %}
            <ul style="display: none;"{% if nav_item.active %} class="current"{% endif %}>
            {% for child in nav_item.children %}
                <li class="toctree-l2{% if child.active %} current{% endif %}">
                <a class="reference internal{% if nav_item.active %} current{% endif %}" href="{{ child.url }}">{{ child.title }}</a>
                </li>
            {% endfor %}
            </ul>
        {% endif %}
    </li>
{% endfor %}
<div class="clearbox"></div>