A red SVG canvas fills the viewport. The example demonstrates a minimal setup for building a custom visualization, with the D3.js library loaded from a CDN. The code selects the `svg` element and applies a red background style, while a separate ES6 module exports a message string that is not yet rendered. The visualization shows only this static colored rectangle, providing a starting point for adding facial features or other shapes using D3's data-binding and SVG generation capabilities.