This example demonstrates the basic setup for a D3 visualization, displaying the text “Hello D3 version 7” at a large scale in the center of the page. It uses version 7 of the D3 library, imported via the `select` function from the `d3` module in `index.js`. The page loads D3 from a CDN and the custom script, with a simple CSS rule controlling the body’s font size and text alignment. The project also includes a README referencing a tutorial video for starting with D3 version 6.