A React application displays CSS named colors as a vertical stack of horizontal bars, one per color, with each bar’s fill matching its hex value. The program fetches a CSV file of named colors using D3’s `csv` utility, then maps each row to a `<div>` element whose background color is set inline from the ‘RGB hex value’ field. The visualization relies on React’s `useEffect` hook to load the data asynchronously and `useState` to hold the parsed result, showing a large “Loading…” message until the data arrives.