The hex color #1a31d1 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#E5CE2E. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#4D64FF, and Hex
#00009E is the 20% darker color. If the color is saturated by 10%, you get
#132CDC. If the color is desaturated by 10%, the color
#2136C6 is obtained.