title: Display First DIV beneath Second DIV
body: <p>say I have...</p>
  
  <pre><code>&lt;div id="A"&gt;&lt;/div&gt;
  &lt;div id="B"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>How can the end-user view div B on top of div A on their browser?</p>
  
  <p>I'm trying to do this with CSS without editing the html.</p>