The hex color #1f3d5f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#E0C2A0. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#527092, and Hex
#000A2C is the 20% darker color. If the color is saturated by 10%, you get
#1C3D62. If the color is desaturated by 10%, the color
#223D5C is obtained.