The hex color #a0170d is a dark color. The web-safe version is Hex
#990000. A complementary color is
#5FE8F2. The grayscale version is
#414141. A 20% lighter version of the original color is
#D34A40, and Hex
#6D0000 is the 20% darker color. If the color is saturated by 10%, you get
#A91308. If the color is desaturated by 10%, the color
#971B12 is obtained.