Color setting options Transparency changes from 0 to 1. it is Also possible to set the format #rgb, #rgba, HSL (hue, saturation, brightness) or HSLA (with a transparency component), for example: #ff0 #f0f8 hsl(200, 100%, 50%) hsla(200, 100%, 50%, 0.1) The transparent color can be set as follows: rgba(0,0,0,0) or the string “transparent”.