The hex color #42a151 is a dark color. The web-safe version is Hex
#339966. A complementary color is
#BD5EAE. The grayscale version is
#676767. A 20% lighter version of the original color is
#75D484, and Hex
#0F6E1E is the 20% darker color. If the color is saturated by 10%, you get
#3EA74F. If the color is desaturated by 10%, the color
#469B53 is obtained.