_includes/header.html

<header class="docs_header">
  <div class="topbar">
    <div class="topbar-left">
      <div>
        <a href="https://royale.apache.org/">
          <img src="https://royale.apache.org/wp-content/uploads/2018/01/apache-royale-tm-logo-light.svg"/>
        </a>
      </div>
    </div>

    <div class="topbar-center">
    </div>

    <div class="topbar-right">
      <button class="topMenu-dropbtn">
        <i class="fa fa-bars"></i> MENU</button>
      <ul class="topMenu">
        {% include main-menu-options.html %}
      </ul>
    </div>
  </div>
</header>