Navbar

Code

<nav class="navbar navbar-expand-lg navbar-dark bg-dark sticky-top">
  <div class="container-fluid">
    <a class="navbar-brand" href="#">Brand</a>
    <button class="navbar-toggler" type="button"
            data-bs-toggle="collapse" data-bs-target="#nav">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="nav">
      <ul class="navbar-nav me-auto">
        <li class="nav-item">
          <a class="nav-link active" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">About</a>
        </li>
      </ul>
      <form class="d-flex">
        <input class="form-control me-2" type="search" placeholder="Search">
        <button class="btn btn-outline-light" type="submit">Go</button>
      </form>
    </div>
  </div>
</nav>

Explanation

The navbar collapses into a toggle button below the expand-lg breakpoint and shows full links above it. navbar-dark/bg-dark style text and background, sticky-top keeps it pinned on scroll. data-bs-toggle attributes wire up the collapse via Bootstrap's JS.

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