The hex color #3d0b1d is a dark color. The web-safe version is Hex
#330033. A complementary color is
#C2F4E2. The grayscale version is
#222222. A 20% lighter version of the original color is
#703E50, and Hex
#0A0000 is the 20% darker color. If the color is saturated by 10%, you get
#40091D. If the color is desaturated by 10%, the color
#3A0D1D is obtained.