The hex color #57539c is a dark color. The web-safe version is Hex
#666699. A complementary color is
#A8AC63. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#8A86CF, and Hex
#242069 is the 20% darker color. If the color is saturated by 10%, you get
#5550A1. If the color is desaturated by 10%, the color
#595697 is obtained.