The hex color #556a9c is a dark color. The web-safe version is Hex
#666699. A complementary color is
#AA9563. The grayscale version is
#747474. A 20% lighter version of the original color is
#889DCF, and Hex
#223769 is the 20% darker color. If the color is saturated by 10%, you get
#5269A0. If the color is desaturated by 10%, the color
#586B98 is obtained.