mkdocs-material/material/partials/nav.html

<nav class="md-nav md-nav--primary">
  <label class="md-nav__title md-nav__title--site" for="drawer">
    <i class="md-icon md-nav__icon">
      {% if config.extra.logo %}
        <img src="{{ base_url }}/{{ config.extra.logo }}" width="24" height="24">
      {% else %}
        school
      {% endif %}
    </i>
    {{ config.site_name }}
  </label>
  {% if config.repo_url %}
    <div class="md-nav__source">
      {% include "partials/source.html" %}
    </div>
  {% endif %}
  <ul class="md-nav__list">
    {% for nav_item in nav %}
      {% set path = "nav-" + loop.index | string %}
      {% include "partials/nav-item.html" %}
    {% endfor %}
  </ul>
</nav>