The hex color #3cc9a3 is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#C3365C. The grayscale version is
#8D8D8D. A 20% lighter version of the original color is
#6FFCD6, and Hex
#099670 is the 20% darker color. If the color is saturated by 10%, you get
#34CFA5. If the color is desaturated by 10%, the color
#44C3A1 is obtained.