The hex color #3ffe9f is a light color. The web-safe version is Hex
#33FF99. A complementary color is
#C00160. The grayscale version is
#9F9F9F. A 20% lighter version of the original color is
#72FFD2, and Hex
#0CCB6C is the 20% darker color. If the color is saturated by 10%, you get
#35FF9F. If the color is desaturated by 10%, the color
#49F49F is obtained.