The hex color #1e66d0 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#E1992F. The grayscale version is
#717171. A 20% lighter version of the original color is
#5199FF, and Hex
#00339D is the 20% darker color. If the color is saturated by 10%, you get
#1665D9. If the color is desaturated by 10%, the color
#2667C7 is obtained.