The hex color #3d1a1f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C2E5E0. The grayscale version is
#272727. A 20% lighter version of the original color is
#704D52, and Hex
#0A0000 is the 20% darker color. If the color is saturated by 10%, you get
#3F191E. If the color is desaturated by 10%, the color
#3B1B20 is obtained.