The hex color #2b3c3d is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D4C3C2. The grayscale version is
#373737. A 20% lighter version of the original color is
#5E6F70, and Hex
#00090A is the 20% darker color. If the color is saturated by 10%, you get
#2A3D3E. If the color is desaturated by 10%, the color
#2C3B3C is obtained.