This example displays a simple "Hello World" message in the center of a webpage. The code sets the text content of a designated `<pre>` element using the standard Document Object Model (DOM) API. It loads D3 version 7 from a CDN, though the visualization logic does not rely on any D3-specific functions. The page uses plain HTML and CSS for layout and styling, with the body configured for centered, large text. The example serves as a minimal demonstration of integrating D3 into a basic web page structure.