The hex color #3f9f11 is a dark color. The web-safe version is Hex
#339900. A complementary color is
#C060EE. The grayscale version is
#505050. A 20% lighter version of the original color is
#72D244, and Hex
#0C6C00 is the 20% darker color. If the color is saturated by 10%, you get
#3DA70B. If the color is desaturated by 10%, the color
#419717 is obtained.