The hex color #57698c is a dark color. The web-safe version is Hex
#666699. A complementary color is
#A89673. The grayscale version is
#6F6F6F. A 20% lighter version of the original color is
#8A9CBF, and Hex
#243659 is the 20% darker color. If the color is saturated by 10%, you get
#55688F. If the color is desaturated by 10%, the color
#596A89 is obtained.