The hex color #3f4c2d is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C0B3D2. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#727F60, and Hex
#0C1900 is the 20% darker color. If the color is saturated by 10%, you get
#3F4D2B. If the color is desaturated by 10%, the color
#3F4B2F is obtained.