The hex color #c9f01d is a light color. The web-safe version is Hex
#CCFF33. A complementary color is
#360FE2. The grayscale version is
#9D9D9D. A 20% lighter version of the original color is
#FCFF50, and Hex
#96BD00 is the 20% darker color. If the color is saturated by 10%, you get
#CDF810. If the color is desaturated by 10%, the color
#C5E82A is obtained.