The hex color #e90d23 is a dark color. The web-safe version is Hex
#FF0033. A complementary color is
#16F2DC. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#FF4056, and Hex
#B60000 is the 20% darker color. If the color is saturated by 10%, you get
#F7051D. If the color is desaturated by 10%, the color
#DB1529 is obtained.