This example displays the text "Hello D3 version 7" centered on a plain white page using the D3.js library. The page loads D3 version 7.8.2 from a CDN and calls `d3.select('body')` to target the body element, then applies `.text(...)` to set its content. The visualization demonstrates a minimal D3 setup, where the HTML structure is predefined and the JavaScript in `index.js` directly manipulates the DOM to produce the static output.