The hex color #3f80c0 is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#C07F3F. The grayscale version is
#808080. A 20% lighter version of the original color is
#72B3F3, and Hex
#0C4D8D is the 20% darker color. If the color is saturated by 10%, you get
#3980C6. If the color is desaturated by 10%, the color
#4580BA is obtained.