This example renders a pie chart from a CSV of CSS named colors, with each slice’s fill matching its hex value. The code uses React’s `useState` and `useEffect` to load the data via `d3.csv`, then builds the chart with `d3.pie` and `d3.arc` inside an SVG path element. It displays the full dataset as equal-width slices, with the chart centered in a 960-by-600 viewport and a large loading message before data arrives.