The hex color #e83f2c is a dark color. The web-safe version is Hex
#FF3333. A complementary color is
#17C0D3. The grayscale version is
#717171. A 20% lighter version of the original color is
#FF725F, and Hex
#B50C00 is the 20% darker color. If the color is saturated by 10%, you get
#F43A25. If the color is desaturated by 10%, the color
#DC4433 is obtained.