This example demonstrates a minimal D3 version 7 setup by rendering the text “Hello D3 version 7” in the center of a web page. It uses the `select` function from the D3 library to target the body element and set its text content. The page imports D3 7.8.5 from a CDN and applies CSS styling with a large font size for visual impact. The code is intentionally simple, showing a foundational starting point for building D3 visualizations.