This example displays the text “Hello D3 version 7” centered on the page in an extremely large font size. It demonstrates a minimal setup for using D3 version 7 via a CDN, with the body selected using `d3.select` and its text content set directly. The page imports the full D3 library from unpkg and runs the script from a separate `bundle.js` file. The rendering is purely DOM-based, with no data binding or visualization elements beyond static text.