The hex color #e8403c is a dark color. The web-safe version is Hex
#FF3333. A complementary color is
#17BFC3. The grayscale version is
#777777. A 20% lighter version of the original color is
#FF736F, and Hex
#B50D09 is the 20% darker color. If the color is saturated by 10%, you get
#F33B36. If the color is desaturated by 10%, the color
#DD4542 is obtained.