mkdocs-material/material/partials/nav.html

<nav class="md-nav md-nav--primary">
  <label class="md-nav__title" for="drawer">{{ site_name }}</label>
  <ul class="md-nav__list">
    {% for nav_item in nav %}
      {% set path = "nav-" + loop.index | string %}
      {% include "partials/nav-item.html" %}
    {% endfor %}
  </ul>
  {% if repo_url %}
    <div class="md-nav__source">
      {% include "partials/source.html" %}
    </div>
  {% endif %}
</nav>