Mother-effing hsl()one sec, bro.
HSL(a) is the jam. It's a piece of cake to do mentally, too. Hue is like this: ROY G BIV is 0 to 300, and then back to red again at 360. Saturation
% is from grey to intense color; lightness
% and alpha
0-1 are easy 'nuff. read more on hsl awesomeness.
Another HSL colorspace mnemonic: our friends RGB are at 0, 120, and 240. And yellow, cyan, magenta (from CMYK) are split between those ones at 60, 180, and 300. Naice!