The hex color #99a40d is a light color. The web-safe version is Hex
#999900. A complementary color is
#665BF2. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#CCD740, and Hex
#667100 is the 20% darker color. If the color is saturated by 10%, you get
#9DA903. If the color is desaturated by 10%, the color
#959F17 is obtained.