The hex color #3bb15d is a light color. The web-safe version is Hex
#339966. A complementary color is
#C44EA2. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#6EE490, and Hex
#087E2A is the 20% darker color. If the color is saturated by 10%, you get
#36B85B. If the color is desaturated by 10%, the color
#40AA5F is obtained.