The hex color #3fd2c5 is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#C02D3A. The grayscale version is
#9D9D9D. A 20% lighter version of the original color is
#72FFF8, and Hex
#0C9F92 is the 20% darker color. If the color is saturated by 10%, you get
#36D7C9. If the color is desaturated by 10%, the color
#48CDC1 is obtained.