The hex color #a8010f is a dark color. The web-safe version is Hex
#990000. A complementary color is
#57FEF0. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#DB3442, and Hex
#750000 is the 20% darker color. If the color is saturated by 10%, you get
#B3000A. If the color is desaturated by 10%, the color
#9D0714 is obtained.