A React application that visualizes CSS named colors as a stacked sequence of horizontal stripes. The example loads color data from a CSV file using D3's `csv` function, then maps each color record to a `<div>` element styled with its corresponding `RGB hex value` as the background color. Each stripe has a fixed width and height, and the page initially displays "Loading..." until the asynchronous data fetch completes. The code combines React hooks (`useState`, `useEffect`) for state management with D3 for data acquisition, rendering the final result as a vertical color spectrum.