My first react pen

index.html

<div id="root">
  <!-- This div's content will be managed by React. -->
</div>

my-first-react-pen.markdown

My first react pen

A Pen by Richard Riley on CodePen.

License.

script.babel

function formatName(user) {
  return user.firstName + ' ' + user.lastName;
}

const user = {
  firstName: 'Harper',
  lastName: 'Perez'
};

const element = (
  <h1>
    Hello, {formatName(user)}!
  </h1>
);

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<h1>Hello, world!</h1>);

scripts

<script src="https://unpkg.com/react/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom/umd/react-dom.development.js"></script>

style.css

body{
background-image: url('data:image/svg+xml,%3Csvg width="42" height="44" viewBox="0 0 42 44" xmlns="http://www.w3.org/2000/svg"%3E%3Cg id="Page-1" fill="none" fill-rule="evenodd"%3E%3Cg id="brick-wall" fill="%239C92AC" fill-opacity="0.4"%3E%3Cpath d="M0 0h42v44H0V0zm1 1h40v20H1V1zM0 23h20v20H0V23zm22 0h20v20H22V23z"/%3E%3C/g%3E%3C/g%3E%3C/svg%3E');
  }