The hex color #a21c0d is a dark color. The web-safe version is Hex
#993300. A complementary color is
#5DE3F2. The grayscale version is
#444444. A 20% lighter version of the original color is
#D54F40, and Hex
#6F0000 is the 20% darker color. If the color is saturated by 10%, you get
#AB1808. If the color is desaturated by 10%, the color
#992012 is obtained.