The hex color #3d566a is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C2A995. The grayscale version is
#545454. A 20% lighter version of the original color is
#70899D, and Hex
#0A2337 is the 20% darker color. If the color is saturated by 10%, you get
#3B566C. If the color is desaturated by 10%, the color
#3F5668 is obtained.