The hex color #1d2e3f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E2D1C0. The grayscale version is
#2E2E2E. A 20% lighter version of the original color is
#506172, and Hex
#00000C is the 20% darker color. If the color is saturated by 10%, you get
#1B2E41. If the color is desaturated by 10%, the color
#1F2E3D is obtained.