The hex color #3f5b95 is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C0A46A. The grayscale version is
#656565. A 20% lighter version of the original color is
#728EC8, and Hex
#0C2862 is the 20% darker color. If the color is saturated by 10%, you get
#3B5A9A. If the color is desaturated by 10%, the color
#435C90 is obtained.