Hello D3
This example displays a large, centered “Hello D3!” message in bright text against a dark background using the Ubuntu font. It demonstrates a minimal D3.js setup where the `select` API targets a `div` element by its `id` and sets its text content from an imported ES6 module. The page loads D3 v5 from a CDN and uses a separate `styles.css` file for typography and color. The simple interaction shows how D3 can manipulate the DOM alongside modern JavaScript module imports.