The hex color #1e3f4d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#E1C0B2. The grayscale version is
#393939. A 20% lighter version of the original color is
#517280, and Hex
#000C1A is the 20% darker color. If the color is saturated by 10%, you get
#1B404F. If the color is desaturated by 10%, the color
#213E4B is obtained.