<div id="content"></div>
const styled = styled.default; //normailly import from npm mmodules

const Button = styled.button`
    background: red;
    border-radius: 100px;
    color: green;
`;

class Application extends React.Component {
  render() {
    return (
      <Button>Click Me</Button>
    )
  }
}

ReactDOM.render(<Application />, document.getElementById('content'));
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External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/react/16.6.1/umd/react.production.min.js
  2. https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.1/umd/react-dom.production.min.js
  3. https://cdnjs.cloudflare.com/ajax/libs/styled-components/3.4.10/styled-components.min.js