mkdocs-material/src/partials/toc-item.html

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<!-- Table of contents item -->
<li class="md-nav__item">
  <a href="{{ toc_item.url }}" title="{{ toc_item.title }}"
      class="md-nav__link">
    {{- toc_item.title -}}
  </a>

  <!-- Render nested item list -->
  {%- if toc_item.children -%}
    <nav class="md-nav">
      <ul class="md-nav__list">
        {%- for toc_item in toc_item.children -%}
          {%- include "partials/toc-item.html" -%}
        {%- endfor -%}
      </ul>
    </nav>
  {% endif %}
</li>