The hex color #4c66b9 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#B39946. The grayscale version is
#797979. A 20% lighter version of the original color is
#7F99EC, and Hex
#193386 is the 20% darker color. If the color is saturated by 10%, you get
#4864BF. If the color is desaturated by 10%, the color
#5168B3 is obtained.