The hex color #3fa25e is a dark color. The web-safe version is Hex
#339966. A complementary color is
#C05DA1. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#72D591, and Hex
#0C6F2B is the 20% darker color. If the color is saturated by 10%, you get
#3BA85D. If the color is desaturated by 10%, the color
#439C5F is obtained.