<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="card-header">
    <ul class="nav nav-tabs card-header-tabs">
        <li class="nav-item">
            <a class="nav-link active" href="#">Tab 1</a>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">Tab 2</a>
        </li>
    </ul>        
</div>
  </body> 
</html>

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.