The hex color #2b3f31 is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D4C0CE. The grayscale version is
#343434. A 20% lighter version of the original color is
#5E7264, and Hex
#000C00 is the 20% darker color. If the color is saturated by 10%, you get
#2A4031. If the color is desaturated by 10%, the color
#2C3E31 is obtained.