The hex color #31d96c is a light color. The web-safe version is Hex
#33CC66. A complementary color is
#CE2693. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#64FF9F, and Hex
#00A639 is the 20% darker color. If the color is saturated by 10%, you get
#29E26A. If the color is desaturated by 10%, the color
#39D06E is obtained.