The hex color #a90b2e is a dark color. The web-safe version is Hex
#990033. A complementary color is
#56F4D1. The grayscale version is
#4B4B4B. A 20% lighter version of the original color is
#DC3E61, and Hex
#760000 is the 20% darker color. If the color is saturated by 10%, you get
#B2052B. If the color is desaturated by 10%, the color
#A01131 is obtained.