The hex color #40d39f is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#BF2C60. The grayscale version is
#919191. A 20% lighter version of the original color is
#73FFD2, and Hex
#0DA06C is the 20% darker color. If the color is saturated by 10%, you get
#38DAA0. If the color is desaturated by 10%, the color
#48CC9E is obtained.