The hex color #a33f3b is a dark color. The web-safe version is Hex
#993333. A complementary color is
#5CC0C4. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#D6726E, and Hex
#700C08 is the 20% darker color. If the color is saturated by 10%, you get
#AA3C37. If the color is desaturated by 10%, the color
#9C423F is obtained.