title: No output React Js for web
body: <p>My react application is giving no output, there are no errors.
  First it worked fine, now the same thing is not working.</p>
  <p>I've tried React.render and ReactDOM.render
  I've tried with and without render()</p>
  <p>App.js</p>
  <pre><code>import ReactDOM from 'react-dom';
  import './index.css';
  
  function Greeting()
  {
    
      return
      (
        &lt;h1&gt;helllo&lt;/h1&gt;
      );
    
  }
  
  
  
  ReactDOM.render
  (
    &lt;Greeting/&gt;,document.getElementById('root')
  );
  
  --------------------------**Index.css**----------------------------------
  
      ```body {
        margin: 0;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
          'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
          sans-serif;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
      }
      
      code {
        font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
          monospace;
      } 
  </code></pre>