The hex color #cf151e is a dark color. The web-safe version is Hex
#CC0033. A complementary color is
#30EAE1. The grayscale version is
#565656. A 20% lighter version of the original color is
#FF4851, and Hex
#9C0000 is the 20% darker color. If the color is saturated by 10%, you get
#DB0F18. If the color is desaturated by 10%, the color
#C31C24 is obtained.