The hex color #3d1921 is a dark color. The web-safe version is Hex
#330033. A complementary color is
#C2E6DE. The grayscale version is
#282828. A 20% lighter version of the original color is
#704C54, and Hex
#0A0000 is the 20% darker color. If the color is saturated by 10%, you get
#3F1820. If the color is desaturated by 10%, the color
#3B1A22 is obtained.