index.js
index.html
App.css
 

import React from 'react';
import ReactDOM from 'react-dom';
import './App.css';
class MyHeader extends React.Component {
  render() {
    return (
      <div>
      <h1>Hello Style!</h1>
      <p>Add a little style!.</p>
      </div>
    );
  }
}
ReactDOM.render(<MyHeader />, document.getElementById('root'));
/*
Notice that you now have three files in your project:
'index.js', 'index.html', and 'App.css'.
*/

body {
  background-color: #282c34;
  color: white;
  padding: 40px;
  font-family: Arial;
  text-align: center;
}
localhost:3000