navbar examples
<nav class="navbar navbar-expand-md bg-dark
navbar-dark">
<!-- Brand -->
<a class="navbar-brand" href="#">Navbar</a>
<!-- Toggler/collapsibe Button -->
<button
class="navbar-toggler" type="button"
data-toggle="collapse" data-target="#collapsibleNavbar">
<span class="navbar-toggler-icon"></span>
</button>
<!-- Navbar links -->
<div class="collapse navbar-collapse"
id="collapsibleNavbar">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link"
href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link"
href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link"
href="#">Link</a>
</li>
</ul>
</div>
</nav>