This example shows a color wheel of CSS named colors loaded from a CSV file via `d3.csv`, with each slice colored by its hex value. It combines React’s `useState` and `useEffect` hooks to fetch data asynchronously, then renders an SVG using `d3.pie` and `d3.arc` to compute the pie geometry within a React component. The `arc` uses an inner radius of zero and an outer radius equal to the SVG width, producing a full circular diagram.