The hex color #3f9ca5 is a light color. The web-safe version is Hex
#339999. A complementary color is
#C0635A. The grayscale version is
#808080. A 20% lighter version of the original color is
#72CFD8, and Hex
#0C6972 is the 20% darker color. If the color is saturated by 10%, you get
#399FA9. If the color is desaturated by 10%, the color
#4699A1 is obtained.