This example demonstrates how to load D3 via UNPKG and use ES6 modules with VizHub. It imports the `select` function from D3 and a custom `message` from a local module, then sets the text of a `#message` div to "Hello VizHub!". The code uses `d3.select` to manipulate the DOM element and applies styling from an external CSS file. The visualization is minimal, showing only the text message centered on the page.