The hex color #3ef8db is a light color. The web-safe version is Hex
#33FFCC. A complementary color is
#C10724. The grayscale version is
#B0B0B0. A 20% lighter version of the original color is
#71FFFF, and Hex
#0BC5A8 is the 20% darker color. If the color is saturated by 10%, you get
#33FFDF. If the color is desaturated by 10%, the color
#49F1D7 is obtained.