The hex color #cf3a38 is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#30C5C7. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#FF6D6B, and Hex
#9C0705 is the 20% darker color. If the color is saturated by 10%, you get
#D93533. If the color is desaturated by 10%, the color
#C53F3D is obtained.