The hex color #c31f08 is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#3CE0F7. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#F6523B, and Hex
#900000 is the 20% darker color. If the color is saturated by 10%, you get
#CF1A01. If the color is desaturated by 10%, the color
#B7240F is obtained.