The hex color #cf3e15 is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#30C1EA. The grayscale version is
#616161. A 20% lighter version of the original color is
#FF7148, and Hex
#9C0B00 is the 20% darker color. If the color is saturated by 10%, you get
#DA3B0D. If the color is desaturated by 10%, the color
#C4411D is obtained.