The hex color #66ad1c is a light color. The web-safe version is Hex
#669933. A complementary color is
#9952E3. The grayscale version is
#656565. A 20% lighter version of the original color is
#99E04F, and Hex
#337A00 is the 20% darker color. If the color is saturated by 10%, you get
#66B415. If the color is desaturated by 10%, the color
#66A623 is obtained.