The hex color #1f3d3a is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E0C2C5. The grayscale version is
#323232. A 20% lighter version of the original color is
#52706D, and Hex
#000A07 is the 20% darker color. If the color is saturated by 10%, you get
#1D3E3B. If the color is desaturated by 10%, the color
#213C39 is obtained.