The hex color #c3363a is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#3CC9C5. The grayscale version is
#666666. A 20% lighter version of the original color is
#F6696D, and Hex
#900307 is the 20% darker color. If the color is saturated by 10%, you get
#CC3136. If the color is desaturated by 10%, the color
#BA3B3E is obtained.