The hex color #3f3f2f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C0C0D0. The grayscale version is
#3A3A3A. A 20% lighter version of the original color is
#727262, and Hex
#0C0C00 is the 20% darker color. If the color is saturated by 10%, you get
#40402E. If the color is desaturated by 10%, the color
#3E3E30 is obtained.