title: 404 image is not showing
body: <p>I have an image: <strong>app/assets/images/oops.jpg</strong></p>
  
  <p>In <strong>404.html</strong> I have:</p>
  
  <pre><code>&lt;html&gt;
  
  &lt;head&gt;
  
    &lt;title&gt;Oops! Where are we?&lt;/title&gt;
    &lt;meta name="viewport" content="width=device-width,initial-scale=1"&gt;
    &lt;style&gt;
    body {
    background: url('oops.jpg') no-repeat center center fixed;
      -webkit-background-size: cover;
      -moz-background-size: cover;
      -o-background-size: cover;
      background-size: cover;
    }
    &lt;/style&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
  
  
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>I confirmed that the image is indeed in production on <strong>Heroku</strong>, but the browser can not find the image. </p>
  
  <p>Here is an image of my files.</p>
  
  <p><a href="https://i.stack.imgur.com/4uk4q.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4uk4q.png" alt="enter image description here"></a></p>
  
  <p>What am I missing here?</p>