The hex color #cf3e29 is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#30C1D6. The grayscale version is
#676767. A 20% lighter version of the original color is
#FF715C, and Hex
#9C0B00 is the 20% darker color. If the color is saturated by 10%, you get
#D93A23. If the color is desaturated by 10%, the color
#C5422F is obtained.