The hex color #d40b4b is a dark color. The web-safe version is Hex
#CC0033. A complementary color is
#2BF4B4. The grayscale version is
#636363. A 20% lighter version of the original color is
#FF3E7E, and Hex
#A10018 is the 20% darker color. If the color is saturated by 10%, you get
#DF0249. If the color is desaturated by 10%, the color
#C9144D is obtained.