The hex color #1d3b3f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E2C4C0. The grayscale version is
#323232. A 20% lighter version of the original color is
#506E72, and Hex
#00080C is the 20% darker color. If the color is saturated by 10%, you get
#1B3C40. If the color is desaturated by 10%, the color
#1F3A3E is obtained.