The hex color #c9c81d is a light color. The web-safe version is Hex
#CCCC33. A complementary color is
#3637E2. The grayscale version is
#8F8F8F. A 20% lighter version of the original color is
#FCFB50, and Hex
#969500 is the 20% darker color. If the color is saturated by 10%, you get
#CFCE12. If the color is desaturated by 10%, the color
#C3C228 is obtained.