The hex color #c73f3b is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#38C0C4. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#FA726E, and Hex
#940C08 is the 20% darker color. If the color is saturated by 10%, you get
#D03B36. If the color is desaturated by 10%, the color
#BE4340 is obtained.