The hex color #3fd8d6 is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#C02729. The grayscale version is
#A4A4A4. A 20% lighter version of the original color is
#72FFFF, and Hex
#0CA5A3 is the 20% darker color. If the color is saturated by 10%, you get
#35DDDB. If the color is desaturated by 10%, the color
#49D3D1 is obtained.