content/_includes/header.html

<header class="main-header">
    <div class="main-header-logo">
      <a href="/" aria-label="Navigation to the PDFBox home page">
        {% include images/pdfbox-toolbox.svg %}
        {% include images/pdfbox-text.svg %}
      </a>
    </div>
    <nav class="wrapper">
      <input type="checkbox" id="menu-toggle">
      <label for="menu-toggle" class="label-toggle"></label>
      <ul>
        <li><a href="/blog">Blog</a></li>
      </ul>
    </nav>
</header>