The hex color #a7312d is a dark color. The web-safe version is Hex
#993333. A complementary color is
#58CED2. The grayscale version is
#575757. A 20% lighter version of the original color is
#DA6460, and Hex
#740000 is the 20% darker color. If the color is saturated by 10%, you get
#AF2D29. If the color is desaturated by 10%, the color
#9F3531 is obtained.