The hex color #2d303e is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D2CFC1. The grayscale version is
#343434. A 20% lighter version of the original color is
#606371, and Hex
#00000B is the 20% darker color. If the color is saturated by 10%, you get
#2C303F. If the color is desaturated by 10%, the color
#2E303D is obtained.