title: How can I place a div over a canvas
body: <p>Please note, I have tried other methods. How do I get the canvas to become a "background" for the div?
  HTML:</p>
  
  <pre><code>&lt;div style="z-index: 1; position: relative;"&gt;
    &lt;div id="fireworks"&gt;&lt;canvas id="canvas"&gt;&lt;/canvas&gt;&lt;/div&gt;
  &lt;/div&gt;
  &lt;div class="page" style="z-index: 50000; height: 100%;"&gt;
    &lt;form id="signup-form"&gt;
      &lt;input style="display:none"&gt;
      &lt;input type="password" style="display:none"&gt;
  ...
  </code></pre>