The hex color #99e40f is a light color. The web-safe version is Hex
#99CC00. A complementary color is
#661BF0. The grayscale version is
#848484. A 20% lighter version of the original color is
#CCFF42, and Hex
#66B100 is the 20% darker color. If the color is saturated by 10%, you get
#9BEE03. If the color is desaturated by 10%, the color
#97DA1B is obtained.