The hex color #2b3d31 is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D4C2CE. The grayscale version is
#333333. A 20% lighter version of the original color is
#5E7064, and Hex
#000A00 is the 20% darker color. If the color is saturated by 10%, you get
#2A3E31. If the color is desaturated by 10%, the color
#2C3C31 is obtained.