The hex color #3fd79c is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#C02863. The grayscale version is
#919191. A 20% lighter version of the original color is
#72FFCF, and Hex
#0CA469 is the 20% darker color. If the color is saturated by 10%, you get
#37DE9D. If the color is desaturated by 10%, the color
#47D09B is obtained.