The hex color #231d27 is a dark color. The web-safe version is Hex
#333333. A complementary color is
#DCE2D8. The grayscale version is
#222222. A 20% lighter version of the original color is
#56505A, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#231C27. If the color is desaturated by 10%, the color
#231E27 is obtained.