The hex color #c40a15 is a dark color. The web-safe version is Hex
#CC0000. A complementary color is
#3BF5EA. The grayscale version is
#4C4C4C. A 20% lighter version of the original color is
#F73D48, and Hex
#910000 is the 20% darker color. If the color is saturated by 10%, you get
#D00310. If the color is desaturated by 10%, the color
#B8111A is obtained.