<!-- navbar-default -->
<nav class="navbar navbar-expand-lg bg-body-tertiary">
  <div class="container-fluid">
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarLight">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarLight">
      <a class="navbar-brand" href="#">Hidden brand</a>
      <ul class="navbar-nav me-auto mt-2 mt-lg-0">
        <li class="nav-item active"><a class="nav-link" href="#">Home</a></li>
        <li class="nav-item"><a class="nav-link" href="#">Link</a></li>
        <li class="nav-item"><a class="nav-link disabled" href="#">Disabled</a></li>
      </ul>
      <form class="form-inline my-2 my-lg-0">
      	<input class="form-control me-sm-2" type="search" placeholder="Search">
      	<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
      </form>
    </div>
  </div>
</nav>

<!-- navbar-dark -->
<nav class="navbar navbar-expand-lg bg-dark" data-bs-theme="dark">
  ...
</nav>