The hex color #3eefcf is a light color. The web-safe version is Hex
#33FFCC. A complementary color is
#C11030. The grayscale version is
#A9A9A9. A 20% lighter version of the original color is
#71FFFF, and Hex
#0BBC9C is the 20% darker color. If the color is saturated by 10%, you get
#33F6D3. If the color is desaturated by 10%, the color
#49E8CB is obtained.