The hex color #2a3c3e is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D5C3C1. The grayscale version is
#373737. A 20% lighter version of the original color is
#5D6F71, and Hex
#00090B is the 20% darker color. If the color is saturated by 10%, you get
#293D3F. If the color is desaturated by 10%, the color
#2B3B3D is obtained.