The hex color #1a40a1 is a dark color. The web-safe version is Hex
#333399. A complementary color is
#E5BF5E. The grayscale version is
#545454. A 20% lighter version of the original color is
#4D73D4, and Hex
#000D6E is the 20% darker color. If the color is saturated by 10%, you get
#143EA9. If the color is desaturated by 10%, the color
#204299 is obtained.