The hex color #556cdc is a dark color. The web-safe version is Hex
#6666CC. A complementary color is
#AA9323. The grayscale version is
#8A8A8A. A 20% lighter version of the original color is
#889FFF, and Hex
#2239A9 is the 20% darker color. If the color is saturated by 10%, you get
#5069E4. If the color is desaturated by 10%, the color
#5A6FD4 is obtained.