Bootstrap 4 Navbars

<?php include 'header.php' ?>

<div class="container-fluid">

<nav class="navbar navbar-expand-sm bg-dark navbar-dark">
	<ul class="navbar-nav">
		<li class="nav-item"><a class="nav-link" href="#">Generic 1</a></li>
		<li class="nav-item"><a class="nav-link" href="#">Generic 2</a></li>
		<li class="nav-item"><a class="nav-link" href="#">Generic 3</a></li>
	</ul>
</nav>

</div>

<?php include 'footer.php' ?>

<?php include 'header.php' ?>

<div class="container-fluid">

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>      
    </ul>    
  </div>
</nav>

</div>

<?php include 'footer.php' ?>