The hex color #2e3d3e is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D1C2C1. The grayscale version is
#383838. A 20% lighter version of the original color is
#617071, and Hex
#000A0B is the 20% darker color. If the color is saturated by 10%, you get
#2D3D3F. If the color is desaturated by 10%, the color
#2F3D3D is obtained.