A React application displays CSS named colors as stacked horizontal bars, each colored according to its RGB value from a CSV dataset. The visualization renders a full-width strip of 4-pixel-tall divs, creating a continuous color gradient that maps the entire color catalog. Using React 17 with hooks like `useState` and `useEffect`, it fetches data via `d3.csv` and conditionally renders a loading state before painting the color swatches. The component-driven approach shows how React manages data fetching and declarative styling with inline `backgroundColor` properties.