The hex color #1d3f2f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E2C0D0. The grayscale version is
#2E2E2E. A 20% lighter version of the original color is
#507262, and Hex
#000C00 is the 20% darker color. If the color is saturated by 10%, you get
#1B412F. If the color is desaturated by 10%, the color
#1F3D2F is obtained.