This example shows a minimal React application that renders the text “React Template” in a blank browser window. It demonstrates the basic structure of a React project, using `ReactDOM.render` to mount an `App` component into a `div` with the id `root`. The code imports `React` and `ReactDOM`, and uses the UMD builds of React 17.0.2 and ReactDOM from unpkg, alongside a separate `bundle.js` file. The body has zero margin and hidden overflow, producing a clean, unobstructed viewport for the component.