color using rbga , [red, blue, green, alpha] > red (0-255), > blue (0-255), > green (0-255), > alpha (0-1) = 0-full transparent, 1-opaque
color using hsla, [ Hue, Saturation, Lightness, alpha ] > hue (0-360) = 0-red, 240-green, 360-blue > saturation (0-100%) = 0-gray, 100-full color > lightness (0-100%) = 0-black, 100-white > alpha (0-1) = 0-full transparent, 1-opaque