This example demonstrates the use of D3.js version 5 to load external libraries via UNPKG and integrate local ES6 modules. It displays the text "Hello VizHub!" in a large, centered message using the `d3.select` API to target the HTML element with the ID `message`. The code imports both D3 functions and a custom message from a separate module, showcasing modular JavaScript development. The styling is handled through a linked CSS file, which sets the font size and alignment for the message.