mkdocs-material/material/partials/header.html

<header class="md-header">
  <nav class="md-header-nav md-grid">
    <div class="md-flex">
      <div class="md-flex__cell md-flex__cell--shrink">
        <label class="md-icon md-icon--menu md-header-nav__icon" for="drawer"></label>
      </div>
      <div class="md-flex__cell md-flex__cell--stretch">
        <span class="md-flex__ellipsis md-header-nav__title">
          {{ page_title | default(site_name, true) }}
        </span>
      </div>
      <div class="md-flex__cell md-flex__cell--shrink">
        <label class="md-icon md-icon--search md-header-nav__icon" for="search"></label>
        {% include "partials/search.html" %}
      </div>
      <div class="md-flex__cell md-flex__cell--shrink">
        <div class="md-header-nav__source">
          {% include "partials/source.html" %}
        </div>
      </div>
    </div>
  </nav>
</header>