title: Background image not showing in jumbotron
body: <p>I'm running Ruby 1.9.3 on Rails 3.2.21. 
  I've added the jumbotron class to the top of my idex.html.erb file. </p>
  
  <pre><code>&lt;div class="jumbotron"&gt;
    &lt;h1&gt;Handcrafted items from &lt;br&gt;
      around the world.&lt;/h1&gt;
    &lt;h2&gt;Discover one-of-a-kind items&lt;/h2&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Then in my <strong>custom.css.scss</strong> file, I've added the info for the background image:</p>
  
  <pre><code>@import "bootstrap";
  
  body {
      background-color: #F5F5F1;
      color: #333333;
      font-family: Arial, Helvetica, sans-serif;
  }
  
  .navbar-default {
      background-color: #EFEFEB;
  }
  
  .navbar-default .navbar-brand {
      font-family: guardian-egyptt, georgia, serif;
      font-weight: 400;
      color: #d5641c;
      font-size: 30px;
  }
  
  .navbar-default .navbar-nav &gt; li &gt; a {
      font-family: Arial, Helvetica, sans-serif;
      font-size: 14px;
      font-weight: bold;
      color: #0192B5;
  }
  
  .center {
      text-align: center;
  }
  
  .col-md-3:nth-child(4n+1) {
      clear: left;
  }
  
  .col-md-6 {
      h3 {font-size: 45px;}
      h5 {font-size: 25px;}
      p {font-size: 18px;}
  }
  
  .caption {
      h3 {
          font-size: 17px;
          margin: 2px;
      }
      p {
          font-size: 15px;
          margin: 0px;
      }
  }
  
  .jumbotron {
      background-image: url('jumbotron.jpg');
  
  }
  </code></pre>
  
  <p>The file <code>jumbotron.jpg</code> has been saved to the <code>app/assets/images</code> folder as instructed. This worked for the instructor, and his jumbotron now displays the background image selected, but mine does not. Mine is just a box with the text in it, and the image is not there.</p>
  
  <p>Am I doing something wrong?</p>