Rainbow
Red
Yellow
Blue
Purple
#FF0000
#FFFF00
#0000FF
#FF00FF
rgb(255,0,0)
rgb(255,255,0)
rgb(0,0,255)
rgb(255,0,255)
hsl(0%,100%,50%)
hsl(60%,100%,50%)
hsl(240%,100%,50%)
hsl(300%,100%,50%)