This example demonstrates the simplest possible D3 setup: it renders the text "Hello D3 version 7" centered on a blank page at a very large font size. The code imports the `select` function from the D3 v7 library and applies it to the document body, setting the text content directly. The page loads D3 from a CDN and includes a separate CSS file that controls text alignment and sizing. This serves as a minimal starter template for building more complex D3 visualizations.