How to create header and footer in React.js?

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

const Header = () => {
  return (
    <header class="header">
      <p>Header Component</p>
    </header>
  );
};

const Footer = () => {
  return (
    <footer class="header">
      <p>Footer Component</p>
    </footer>
  );
};

const App = () => {
  return (
    <React.Fragment>
      <Header />
      <Footer />
    </React.Fragment>
  );
};

ReactDOM.render(<App />, document.getElementById("root"));

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// Header.js
import React from "react";

const Header = () => {
  return (
    <header>
      <nav>
        <h1>My header</h1>
      </nav>
    </header>
  );
};

export default Header;

// Footer.js
import React from "react";

const Footer = () => {
  return (
    <footer>
      <p>My footer</p>
    </footer>
  );
};

export default Footer;

// App.js
import React from "react";
import Header from "./Header";
import Footer from "./Footer";

const App = () => {
  return (
    <div>
      <Header />
      <main>
        <p>Main content</p>
      </main>
      <Footer />
    </div>
  );
};

export default App;