index.js
index.html
 


import React from 'react';
import ReactDOM from 'react-dom';

class MyHeader extends React.Component {
  render() {
    return (
      <div>
      <h1 style={{backgroundColor: "lightblue"}}>Hello Style!</h1>
      <p>Add a little style!.</p>
      </div>
    );
  }
}

ReactDOM.render(<MyHeader />, document.getElementById('root'));

localhost:3000