The hex color #1e4b4f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#E1B4B0. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#517E82, and Hex
#00181C is the 20% darker color. If the color is saturated by 10%, you get
#1B4C51. If the color is desaturated by 10%, the color
#214A4D is obtained.