The hex color #d90c2d is a dark color. The web-safe version is Hex
#CC0033. A complementary color is
#26F3D2. The grayscale version is
#5B5B5B. A 20% lighter version of the original color is
#FF3F60, and Hex
#A60000 is the 20% darker color. If the color is saturated by 10%, you get
#E60428. If the color is desaturated by 10%, the color
#CC1432 is obtained.