The hex color #2d3e3e is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D2C1C1. The grayscale version is
#383838. A 20% lighter version of the original color is
#607171, and Hex
#000B0B is the 20% darker color. If the color is saturated by 10%, you get
#2C3F3F. If the color is desaturated by 10%, the color
#2E3D3D is obtained.