The hex color #e40a0b is a dark color. The web-safe version is Hex
#CC0000. A complementary color is
#1BF5F4. The grayscale version is
#535353. A 20% lighter version of the original color is
#FF3D3E, and Hex
#B10000 is the 20% darker color. If the color is saturated by 10%, you get
#F30304. If the color is desaturated by 10%, the color
#D61112 is obtained.