The hex color #2a3f2f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D5C0D0. The grayscale version is
#333333. A 20% lighter version of the original color is
#5D7262, and Hex
#000C00 is the 20% darker color. If the color is saturated by 10%, you get
#29402F. If the color is desaturated by 10%, the color
#2B3E2F is obtained.