header.php

<div class="container">
  <header class="d-flex flex-wrap py-3 mb-4 border-bottom">
    <a href="/" class="d-flex align-items-center mb-3 mb-md-0 me-md-auto text-dark text-decoration-none">
      <span class="fs-4">Home</span>
    </a>

    <ul class="nav nav-pills">
      <li class="nav-item"><a href="/referrer/" class="nav-link">Referrer</a></li>
      <li class="nav-item"><a href="/cookie/" class="nav-link">Cookie</a></li>
      <li class="nav-item"><a href="/form/" class="nav-link">Form</a></li>
      <li class="nav-item"><a href="/dynamic-link/" class="nav-link">Dynamic Link</a></li>
      <li class="nav-item"><a href="/csrf/" class="nav-link">CSRF</a></li>
      <li class="nav-item"><a href="/ip/" class="nav-link">IP</a></li>
      <li class="nav-item"><a href="/jwt/" class="nav-link">JWT</a></li>
      <li class="nav-item"><a href="/basicauth/" class="nav-link">Basic Auth</a></li>
    </ul>
  </header>
</div>