The hex color #661a1c is a dark color. The web-safe version is Hex
#663333. A complementary color is
#99E5E3. The grayscale version is
#343434. A 20% lighter version of the original color is
#994D4F, and Hex
#330000 is the 20% darker color. If the color is saturated by 10%, you get
#6B171A. If the color is desaturated by 10%, the color
#611D1E is obtained.