React Starter
This example demonstrates a minimal React application that renders the text “Hello React!” centered on the page using a large, bold font. It imports the `React` and `ReactDOM` libraries, then defines an `App` component as a function that returns a single `div` with the CSS class `message`. ReactDOM’s `render` method mounts this component to the `#root` element in the HTML file. The setup uses the production builds of React 16.10.0, with the component logic contained in a separate `index.js` file bundled into `bundle.js` for the browser.