title: Bootstrap hamburger menu is in page but not visible
body: <p>I'm working on a left navbar for Bootstrap, and it is working fine except for one little thing that is driving me crazy.</p>
  
  <p>The hamburger menu is in the page for narrower screens but it is not visible.  I know it is there because I can click on it and it works and I can see it when I inspect the element in Chrome.</p>
  
  <p>I've included a minimal snippet.  Click where the hamburger menu is supposed to be and you will see the menu expand.  Can you make the hamburger menu show itself?</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-css lang-css prettyprint-override"><code>.navbar-left {
    overflow: auto;
    font-weight: 200;
    color: #fff;
    background-color: #3d486f;
    position: fixed;
    top: 0px;
    width: 250px;
    height: 100%;
  }
  .navbar-left a { color: #fff; }
  .navbar-left-header { margin: 15px 0; }
  .navbar-left ul, .navbar-left li { list-style: none; }
  .navbar-clear { clear: left; }
  @media (max-width: 767px) {
    .navbar-left {
      position: relative;
      width: 100%;
      margin-bottom: 10px;
    }
    .navbar-left .navbar-toggle { display: block; }
  }
  @media (min-width: 768px) {
    #menu-content { display: block; }
    .navbar-left .navbar-toggle { display: none; }
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"&gt;&lt;/script&gt;
  &lt;link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/&gt;
  &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"&gt;&lt;/script&gt;
  
  &lt;div class="navbar-left"&gt;
  
  &lt;div class="navbar-left-header"&gt;
  Title
  &lt;button type="button" data-toggle="collapse" data-target="#menu-content" aria-expanded="false" aria-controls="navbar" class="collapsed navbar-toggle"&gt;
    &lt;span class="sr-only"&gt;Toggle navigation&lt;/span&gt;
    &lt;span class="icon-bar"&gt;&lt;/span&gt;
    &lt;span class="icon-bar"&gt;&lt;/span&gt;
    &lt;span class="icon-bar"&gt;&lt;/span&gt;
  &lt;/button&gt;
  &lt;/div&gt;
  &lt;div class="navbar-clear"&gt;&lt;/div&gt;
  
  &lt;ul id="menu-content" class="collapse"&gt;
    &lt;li&gt;First&lt;/li&gt;
    &lt;li&gt;Second&lt;/li&gt;
    &lt;li&gt;Third&lt;/li&gt;
    &lt;li&gt;Fourth&lt;/li&gt;
  &lt;/ul&gt;
  &lt;/div&gt;
  
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>