The hex color #e3313e is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#1CCEC1. The grayscale version is
#717171. A 20% lighter version of the original color is
#FF6471, and Hex
#B0000B is the 20% darker color. If the color is saturated by 10%, you get
#EE2B39. If the color is desaturated by 10%, the color
#D83743 is obtained.