The hex color #3f76c7 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C08938. The grayscale version is
#7F7F7F. A 20% lighter version of the original color is
#72A9FA, and Hex
#0C4394 is the 20% darker color. If the color is saturated by 10%, you get
#3975CE. If the color is desaturated by 10%, the color
#4577C0 is obtained.