The hex color #66d64c is a light color. The web-safe version is Hex
#66CC33. A complementary color is
#9929B3. The grayscale version is
#838383. A 20% lighter version of the original color is
#99FF7F, and Hex
#33A319 is the 20% darker color. If the color is saturated by 10%, you get
#63DE47. If the color is desaturated by 10%, the color
#69CE51 is obtained.