The hex color #e13f3d is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#1EC0C2. The grayscale version is
#747474. A 20% lighter version of the original color is
#FF7270, and Hex
#AE0C0A is the 20% darker color. If the color is saturated by 10%, you get
#EC3A37. If the color is desaturated by 10%, the color
#D64443 is obtained.