The hex color #1a1b4f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#E5E4B0. The grayscale version is
#2C2C2C. A 20% lighter version of the original color is
#4D4E82, and Hex
#00001C is the 20% darker color. If the color is saturated by 10%, you get
#181953. If the color is desaturated by 10%, the color
#1C1D4C is obtained.