This example visualizes CSS named colors as a pie chart, where each slice represents one color from a dataset loaded via `d3.csv`. The visualization fills the entire browser window, with each slice colored by its corresponding hex value. Built with React and D3 v7, the code uses React’s `useState` and `useEffect` hooks to fetch the CSV asynchronously, displaying a “Loading…” message until the data arrives. The pie geometry is generated using `d3.arc` with an inner radius of zero, and the SVG paths are rendered dynamically based on the loaded data.