The hex color #3f8001 is a dark color. The web-safe version is Hex
#339900. A complementary color is
#C07FFE. The grayscale version is
#404040. A 20% lighter version of the original color is
#72B334, and Hex
#0C4D00 is the 20% darker color. If the color is saturated by 10%, you get
#3F8600. If the color is desaturated by 10%, the color
#3F7A07 is obtained.