The hex color #2D283F is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D2D7C0. The grayscale version is
#313131. A 20% lighter version of the original color is
#605B72, and Hex
#00000C is the 20% darker color. If the color is saturated by 10%, you get
#2D2740. If the color is desaturated by 10%, the color
#2D293E is obtained.