Conic gradients transition colors around a 360-degree rotational angle.
background: conic-gradient(from 0deg at 50% 50%, #FF0000, #FFFF00, #00FF00, #00FFFF, #0000FF, #FF00FF, #FF0000);background: conic-gradient(from 90deg at 50% 50%, #7A00FF, #00E5FF, #7A00FF);