The hex color #1f3da5 is a dark color. The web-safe version is Hex
#333399. A complementary color is
#E0C25A. The grayscale version is
#565656. A 20% lighter version of the original color is
#5270D8, and Hex
#000A72 is the 20% darker color. If the color is saturated by 10%, you get
#1A3BAD. If the color is desaturated by 10%, the color
#243F9D is obtained.