The hex color #c40d25 is a dark color. The web-safe version is Hex
#CC0033. A complementary color is
#3BF2DA. The grayscale version is
#525252. A 20% lighter version of the original color is
#F74058, and Hex
#910000 is the 20% darker color. If the color is saturated by 10%, you get
#CF0621. If the color is desaturated by 10%, the color
#B9142A is obtained.