The hex color #3f587c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C0A783. The grayscale version is
#5C5C5C. A 20% lighter version of the original color is
#728BAF, and Hex
#0C2549 is the 20% darker color. If the color is saturated by 10%, you get
#3C587F. If the color is desaturated by 10%, the color
#425879 is obtained.