Bootstrap navbar collapse button not showing
<p>I'm making an application with bootstrap and I have a nav bar, however for some reason when I resize the page the links disappear but the toggle button doesn't show.</p>

<p>Here is my nav bar:</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/3.4.0/css/bootstrap.min.css"&gt;
&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"&gt;&lt;/script&gt;

&lt;nav class="navbar navbar-default"&gt;
  &lt;div class="container-fluid"&gt;
    &lt;div class="navbar-header"&gt;
      &lt;div class="navbar-brand"&gt;title&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"&gt;
      &lt;ul class="nav navbar-nav navbar-right"&gt;
          &lt;li&gt;one&lt;/li&gt;
          &lt;li&gt;two&lt;/li&gt;
          &lt;li&gt;three&lt;/li&gt;
          &lt;li&gt;four&lt;/li&gt;
      &lt;/ul&gt;
  &lt;/div&gt;
&lt;/nav&gt;</code></pre>
</div>
</div>
</p>

<p>Any help to fix this would be greatly appreciated. </p>