offcanvas.html

<aside class="right-off-canvas-menu">
  <ul>
    {% 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 %}" id="{{ child.title }}" href="{{ child.url }}">{{ child.title }}</a>
          </li>
        {% endfor %}
        </ul>
      {% endif %}
    </li>
    {% endfor %}
  </ul>
</aside>