The hex color #1a40b3 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#E5BF4C. The grayscale version is
#5A5A5A. A 20% lighter version of the original color is
#4D73E6, and Hex
#000D80 is the 20% darker color. If the color is saturated by 10%, you get
#143DBC. If the color is desaturated by 10%, the color
#2043AA is obtained.