The hex color #1d3fd3 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#E2C02C. The grayscale version is
#656565. A 20% lighter version of the original color is
#5072FF, and Hex
#000CA0 is the 20% darker color. If the color is saturated by 10%, you get
#163BDE. If the color is desaturated by 10%, the color
#2443C8 is obtained.