console.clear();
const header = () => <header>Header</header>;
const div = () => <div>Hello React</div>;
const footer = () => <footer>footer</footer>;

const App = () => {
  return (
    <div>
      <header />
      <div />
      <footer />
    </div>
  )
}

const root = ReactDOM.createRoot(document.querySelector('#root'));
root.render(<App />);