This example shows a minimal React application that renders a large, centered text message reading “Hello React 123! whats up with you” inside a full-page layout. It demonstrates how to mount a React component into the DOM using `createRoot` from `react-dom` and render a functional component that returns JSX. The page loads React and ReactDOM from unpkg CDN scripts, and the CSS styles the message with a font size of 13em and center alignment. The code relies solely on React’s component model without any additional data or visualization logic.