This example shows a React application that renders a static page. The code imports a `Book` component and displays a heading with the text “Hello Neenu”. The application uses React and ReactDOM, loaded via CDN and local imports, to structure a simple, single-element interface. The `App` component calls `ReactDOM.render` to mount the `Book` component into the HTML element with the ID `root`. The page includes minimal CSS styling for the message, but no interactive or data-driven behavior is present.