This example demonstrates a minimal React + D3 starter template for building SVG visualizations with a reusable margin convention. It fetches Hepatitis C data from a CSV URL using a custom `useData` hook built with `useEffect` and `useState`, loading via D3’s `csv` method. A `VizContainer` component abstracts the SVG and group elements, translating the inner group by the specified margins and conditionally rendering gray rectangles to visualize the chart area. The code relies on CDN-loaded React 16, ReactDOM, and D3 v6, with dimensions hardcoded at 960 by 500 pixels.