The hex color #3f6b3f is a dark color. The web-safe version is Hex
#336633. A complementary color is
#C094C0. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#729E72, and Hex
#0C380C is the 20% darker color. If the color is saturated by 10%, you get
#3E6E3E. If the color is desaturated by 10%, the color
#406840 is obtained.