Hello VizHub
This example demonstrates VizHub’s ability to render a simple, full-screen message using D3 v5. It displays the text “Hello VizHub!” centered on a dark blue background with large Ubuntu font styling. The code uses D3’s `select` API to set the text content of a `div`, while a separate ES6 module exports the message string. The page loads D3 from a CDN and applies styling through an external CSS file.