The hex color #3f567c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C0A983. The grayscale version is
#5B5B5B. A 20% lighter version of the original color is
#7289AF, and Hex
#0C2349 is the 20% darker color. If the color is saturated by 10%, you get
#3C567F. If the color is desaturated by 10%, the color
#425779 is obtained.