The hex color #a0403d is a dark color. The web-safe version is Hex
#993333. A complementary color is
#5FBFC2. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#D37370, and Hex
#6D0D0A is the 20% darker color. If the color is saturated by 10%, you get
#A73D3A. If the color is desaturated by 10%, the color
#9A4340 is obtained.