The hex color #3d1d2c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C2E2D3. The grayscale version is
#2D2D2D. A 20% lighter version of the original color is
#70505F, and Hex
#0A0000 is the 20% darker color. If the color is saturated by 10%, you get
#3F1B2C. If the color is desaturated by 10%, the color
#3B1F2C is obtained.