<header class="bg-dark text-white py-3">
  <div class="container d-flex justify-content-between align-items-center">
    <a href="#" class="text-white h4 mb-0">ModernKit</a>
    <nav>
      <ul class="list-unstyled d-flex mb-0">
        <li class="ml-3"><a href="#" class="text-white">Home</a></li>
        <li class="ml-3"><a href="#" class="text-white">About</a></li>
        <li class="ml-3"><a href="#" class="text-white">Contact</a></li>
      </ul>
    </nav>
  </div>
</header>