The hex color #c5211a is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#3ADEE5. The grayscale version is
#555555. A 20% lighter version of the original color is
#F8544D, and Hex
#920000 is the 20% darker color. If the color is saturated by 10%, you get
#D01C14. If the color is desaturated by 10%, the color
#BA2620 is obtained.