-- Header -->
    <header class="container">
      <hgroup>
        <h1>Pico + Bootstrap grid system</h1>
        <p>
          Custom CSS build with the
          <a href="https://getbootstrap.com/docs/5.2/layout/grid/">Bootstrap grid system</a> to
          manage complex grid layouts in <a href="https://github.com/picocss/pico">Pico</a>
        </p>
      </hgroup>
      <nav>
        <ul>
          <li>
            <details role="list">
              <summary aria-haspopup="listbox">Theme</summary>
    