This example demonstrates how to build a simple face using D3.js within a React framework. The page renders an SVG with a red background, and the face is composed of line elements styled with black strokes and green paths. D3’s `select` function is used to grab the SVG element and apply the background color, while the `lines` CSS class defines the stroke properties for the facial features. The visualization sources data from a minimal HTML file that loads D3 v5 from a CDN.