The hex color #1d3a3c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E2C5C3. The grayscale version is
#313131. A 20% lighter version of the original color is
#506D6F, and Hex
#000709 is the 20% darker color. If the color is saturated by 10%, you get
#1B3B3D. If the color is desaturated by 10%, the color
#1F393B is obtained.