The hex color #3fb18f is a light color. The web-safe version is Hex
#339999. A complementary color is
#C04E70. The grayscale version is
#808080. A 20% lighter version of the original color is
#72E4C2, and Hex
#0C7E5C is the 20% darker color. If the color is saturated by 10%, you get
#39B691. If the color is desaturated by 10%, the color
#45AC8D is obtained.