The hex color #1a2f3e is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E5D0C1. The grayscale version is
#2D2D2D. A 20% lighter version of the original color is
#4D6271, and Hex
#00000B is the 20% darker color. If the color is saturated by 10%, you get
#182F40. If the color is desaturated by 10%, the color
#1C2F3C is obtained.