The hex color #3d4b2f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C2B4D0. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#707E62, and Hex
#0A1800 is the 20% darker color. If the color is saturated by 10%, you get
#3D4C2E. If the color is desaturated by 10%, the color
#3D4A30 is obtained.