title: Can't set background color for container-fluid
body: <p>Only the nav container gets its background color, but I want the whole fluid container to be dark.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
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  <pre class="snippet-code-css lang-css prettyprint-override"><code>.dark-nav {
    background-color: #222;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"&gt;&lt;/script&gt;
  &lt;!-- Latest compiled and minified CSS --&gt;
  &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"&gt;
  &lt;!-- Latest compiled and minified JavaScript --&gt;
  &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"&gt;&lt;/script&gt;
  
  &lt;div class="container-fluid dark-nav"&gt;
    &lt;nav class="navbar fixed-top navbar-dark dark-nav navbar-expand-lg container"&gt;
      *Navbar content here*
    &lt;/nav&gt;
  &lt;/div&gt;</code></pre>
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  </div>
  </p>