The hex color #596fab is a dark color. The web-safe version is Hex
#666699. A complementary color is
#A69054. The grayscale version is
#7C7C7C. A 20% lighter version of the original color is
#8CA2DE, and Hex
#263C78 is the 20% darker color. If the color is saturated by 10%, you get
#566EB0. If the color is desaturated by 10%, the color
#5C70A6 is obtained.