The hex color #a80b18 is a dark color. The web-safe version is Hex
#990000. A complementary color is
#57F4E7. The grayscale version is
#444444. A 20% lighter version of the original color is
#DB3E4B, and Hex
#750000 is the 20% darker color. If the color is saturated by 10%, you get
#B20514. If the color is desaturated by 10%, the color
#9E111C is obtained.