The hex color #20211c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#DFDEE3. The grayscale version is
#1F1F1F. A 20% lighter version of the original color is
#53544F, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#20211C. If the color is desaturated by 10%, the color
#20211C is obtained.