title: Bootstrap 4 is not working
body: <p>I'm trying to integrate <code>bootstrap4</code> to my website but the <code>navbar</code> is not working. All the attributes is crossout in the css. Can someone help me about this?</p>
  
  <p>result
  <a href="https://i.stack.imgur.com/5qmsf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5qmsf.png" alt="enter image description here"></a></p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous"&gt;
  &lt;nav class="navbar navbar-expand-sm bg-light"&gt;
    &lt;ul class="navbar-nav"&gt;
      &lt;li class="nav-item"&gt;
        &lt;a class="nav-link" href="#"&gt;Link 1&lt;/a&gt;
      &lt;/li&gt;
      &lt;li class="nav-item"&gt;
        &lt;a class="nav-link" href="#"&gt;Link 2&lt;/a&gt;
      &lt;/li&gt;
      &lt;li class="nav-item"&gt;
        &lt;a class="nav-link" href="#"&gt;Link 3&lt;/a&gt;
      &lt;/li&gt;
    &lt;/ul&gt;
  &lt;/nav&gt;</code></pre>
  </div>
  </div>
  </p>