The hex color #e40d1d is a dark color. The web-safe version is Hex
#CC0033. A complementary color is
#1BF2E2. The grayscale version is
#5A5A5A. A 20% lighter version of the original color is
#FF4050, and Hex
#B10000 is the 20% darker color. If the color is saturated by 10%, you get
#F20517. If the color is desaturated by 10%, the color
#D61523 is obtained.