The hex color #555a7a is a dark color. The web-safe version is Hex
#666666. A complementary color is
#AAA585. The grayscale version is
#636363. A 20% lighter version of the original color is
#888DAD, and Hex
#222747 is the 20% darker color. If the color is saturated by 10%, you get
#54597C. If the color is desaturated by 10%, the color
#565B78 is obtained.