React Base Fiddle (JSX)

Starting point for creating JSFiddles with React.

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/[email protected]/dist/style-it-standalone.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

Babel + JSX

class Intro extends React.Component {
  render() {
    return (
    	<Style>
      	{`
          .intro {
            font-size: 40px;
          }
        `}
   
        <p className="intro">CSS-in-JS made simple -- just Style It.</p>
    	</Style>
    );
  }
}

ReactDOM.render(
  <Intro />,
  document.getElementById('container')
);