The hex color #a3121d is a dark color. The web-safe version is Hex
#990033. A complementary color is
#5CEDE2. The grayscale version is
#464646. A 20% lighter version of the original color is
#D64550, and Hex
#700000 is the 20% darker color. If the color is saturated by 10%, you get
#AC0D19. If the color is desaturated by 10%, the color
#9A1721 is obtained.