The hex color #a81f0f is a dark color. The web-safe version is Hex
#993300. A complementary color is
#57E0F0. The grayscale version is
#474747. A 20% lighter version of the original color is
#DB5242, and Hex
#750000 is the 20% darker color. If the color is saturated by 10%, you get
#B21B09. If the color is desaturated by 10%, the color
#9E2315 is obtained.