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This example renders a large, centered “Hello React!” message on a plain white page. The code uses React and ReactDOM to mount a single functional component into a `#root` element. Although it imports D3 functions such as `scaleTime`, `scaleLinear`, `extent`, and `line`, none of these are actually used. The component’s message is styled with a 13-em font size and centered via the `.message` CSS class, demonstrating a minimal React setup with unused D3 dependencies.