The hex color #99b31c is a light color. The web-safe version is Hex
#99CC33. A complementary color is
#664CE3. The grayscale version is
#787878. A 20% lighter version of the original color is
#CCE64F, and Hex
#668000 is the 20% darker color. If the color is saturated by 10%, you get
#9CB913. If the color is desaturated by 10%, the color
#96AD25 is obtained.