<html lang="en">

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">

</head>

<body>
  <nav class="navbar navbar-expand-md navbar-light bg-light">
    <a href="#" class="navbar-brand">BRAND</a>

    <ul class="navbar-nav">
      <li class="nav-item">
        <a href="#" class="nav-link">Link 1</a>
      </li>
      <li class="nav-item">
        <a href="#" class="nav-link">Link 2</a>
      </li>
      <li class="nav-item">
        <a href="#" class="nav-link">Link 3</a>
      </li>
    </ul>

  </nav>
</body>

<!-- Required Javascript -->
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>

<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>

</html>

External CSS

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External JavaScript

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