The hex color #d43c3c is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#2BC3C3. The grayscale version is
#6F6F6F. A 20% lighter version of the original color is
#FF6F6F, and Hex
#A10909 is the 20% darker color. If the color is saturated by 10%, you get
#DE3737. If the color is desaturated by 10%, the color
#CA4141 is obtained.