The hex color #d40a1b is a dark color. The web-safe version is Hex
#CC0033. A complementary color is
#2BF5E4. The grayscale version is
#535353. A 20% lighter version of the original color is
#FF3D4E, and Hex
#A10000 is the 20% darker color. If the color is saturated by 10%, you get
#E10315. If the color is desaturated by 10%, the color
#C71121 is obtained.