The hex color #c4e66b is a light color. The web-safe version is Hex
#CCFF66. A complementary color is
#3B1994. The grayscale version is
#B2B2B2. A 20% lighter version of the original color is
#F7FF9E, and Hex
#91B338 is the 20% darker color. If the color is saturated by 10%, you get
#C6EB64. If the color is desaturated by 10%, the color
#C2E172 is obtained.