The hex color #39b31b is a dark color. The web-safe version is Hex
#33CC33. A complementary color is
#C64CE4. The grayscale version is
#585858. A 20% lighter version of the original color is
#6CE64E, and Hex
#068000 is the 20% darker color. If the color is saturated by 10%, you get
#36BC15. If the color is desaturated by 10%, the color
#3CAA21 is obtained.