The hex color #586C92 is a dark color. The web-safe version is Hex
#666699. A complementary color is
#A7936D. The grayscale version is
#727272. A 20% lighter version of the original color is
#8B9FC5, and Hex
#25395F is the 20% darker color. If the color is saturated by 10%, you get
#556B95. If the color is desaturated by 10%, the color
#5B6D8F is obtained.