The hex color #3d291c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C2D6E3. The grayscale version is
#2B2B2B. A 20% lighter version of the original color is
#705C4F, and Hex
#0A0000 is the 20% darker color. If the color is saturated by 10%, you get
#3F291A. If the color is desaturated by 10%, the color
#3B291E is obtained.