title: React - Extremely simple Codepen will not show up
body: <p>I have a codepen. I need it to literally say "Hello world" with React. I can't get the code to render. </p>
  
  <p>I have Babel set as the pre-compiler. </p>
  
  <p>I have both React and ReactDOM linked. </p>
  
  <p>Here is all of the HTML: </p>
  
  <pre><code>&lt;div id="app"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>Here is all of the JS: </p>
  
  <pre><code>class App extends React.Component {
    render() {
      &lt;div&gt;
        &lt;p&gt;Hello!&lt;/p&gt;
      &lt;/div&gt;
    }
  }
  
  ReactDOM.render(&lt;App /&gt;, document.getElementById('app')); 
  </code></pre>
  
  <p>I need to get this going for an interview in an hour or two. Just can't get it working here. Help!</p>