The hex color #031e37 is a dark color. The web-safe version is Hex
#003333. A complementary color is
#FCE1C8. The grayscale version is
#1D1D1D. A 20% lighter version of the original color is
#36516A, and Hex
#000004 is the 20% darker color. If the color is saturated by 10%, you get
#001E3A. If the color is desaturated by 10%, the color
#061E34 is obtained.