The hex color #1e3d3f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E1C2C0. The grayscale version is
#333333. A 20% lighter version of the original color is
#517072, and Hex
#000A0C is the 20% darker color. If the color is saturated by 10%, you get
#1C3E40. If the color is desaturated by 10%, the color
#203C3E is obtained.