The hex color #a11b15 is a dark color. The web-safe version is Hex
#993300. A complementary color is
#5EE4EA. The grayscale version is
#464646. A 20% lighter version of the original color is
#D44E48, and Hex
#6E0000 is the 20% darker color. If the color is saturated by 10%, you get
#AA1710. If the color is desaturated by 10%, the color
#981F1A is obtained.