The hex color #231f28 is a dark color. The web-safe version is Hex
#333333. A complementary color is
#DCE0D7. The grayscale version is
#232323. A 20% lighter version of the original color is
#56525B, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#231F28. If the color is desaturated by 10%, the color
#231F28 is obtained.