The hex color #c82d0d is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#37D2F2. The grayscale version is
#565656. A 20% lighter version of the original color is
#FB6040, and Hex
#950000 is the 20% darker color. If the color is saturated by 10%, you get
#D32906. If the color is desaturated by 10%, the color
#BD3114 is obtained.