This example renders a pie chart of CSS named colors using React and D3 v5. It loads color data from a CSV file via `d3.csv`, then uses a `pie` generator and an `arc` generator to compute the pie slices. Each slice is rendered as an SVG `<path>` element filled with its corresponding RGB hex value from the dataset. The React component manages the asynchronous data loading with `useEffect` and displays a loading state until data arrives. The visualization showcases the full spectrum of CSS color names in a circular layout.