The hex color #66c24f is a light color. The web-safe version is Hex
#66CC66. A complementary color is
#993DB0. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#99F582, and Hex
#338F1C is the 20% darker color. If the color is saturated by 10%, you get
#64C94A. If the color is desaturated by 10%, the color
#68BB54 is obtained.