The hex color #3EC2DF is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#C13D20. The grayscale version is
#A0A0A0. A 20% lighter version of the original color is
#71F5FF, and Hex
#0B8FAC is the 20% darker color. If the color is saturated by 10%, you get
#34C5E5. If the color is desaturated by 10%, the color
#48BFD9 is obtained.