The hex color #cf1d2a is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#30E2D5. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#FF505D, and Hex
#9C0000 is the 20% darker color. If the color is saturated by 10%, you get
#DA1725. If the color is desaturated by 10%, the color
#C4232F is obtained.