The hex color #3fc9af is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#C03650. The grayscale version is
#929292. A 20% lighter version of the original color is
#72FCE2, and Hex
#0C967C is the 20% darker color. If the color is saturated by 10%, you get
#37CEB2. If the color is desaturated by 10%, the color
#47C4AC is obtained.