The hex color #1d2e3e is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E2D1C1. The grayscale version is
#2E2E2E. A 20% lighter version of the original color is
#506171, and Hex
#00000B is the 20% darker color. If the color is saturated by 10%, you get
#1B2E40. If the color is desaturated by 10%, the color
#1F2E3C is obtained.