The hex color #031d3c is a dark color. The web-safe version is Hex
#003333. A complementary color is
#FCE2C3. The grayscale version is
#1F1F1F. A 20% lighter version of the original color is
#36506F, and Hex
#000009 is the 20% darker color. If the color is saturated by 10%, you get
#001D3F. If the color is desaturated by 10%, the color
#061D39 is obtained.