The hex color #a40d39 is a dark color. The web-safe version is Hex
#990033. A complementary color is
#5BF2C6. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#D7406C, and Hex
#710006 is the 20% darker color. If the color is saturated by 10%, you get
#AD0737. If the color is desaturated by 10%, the color
#9B143B is obtained.