The hex color #2a3f1f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D5C0E0. The grayscale version is
#2D2D2D. A 20% lighter version of the original color is
#5D7252, and Hex
#000C00 is the 20% darker color. If the color is saturated by 10%, you get
#2A411E. If the color is desaturated by 10%, the color
#2A3D20 is obtained.