The hex color #a8372b is a dark color. The web-safe version is Hex
#993333. A complementary color is
#57C8D4. The grayscale version is
#595959. A 20% lighter version of the original color is
#DB6A5E, and Hex
#750400 is the 20% darker color. If the color is saturated by 10%, you get
#B03426. If the color is desaturated by 10%, the color
#A03A30 is obtained.