The hex color #557ccc is a dark color. The web-safe version is Hex
#6666CC. A complementary color is
#AA8333. The grayscale version is
#8A8A8A. A 20% lighter version of the original color is
#88AFFF, and Hex
#224999 is the 20% darker color. If the color is saturated by 10%, you get
#507BD3. If the color is desaturated by 10%, the color
#5A7DC5 is obtained.