The hex color #40d78f is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#BF2870. The grayscale version is
#8D8D8D. A 20% lighter version of the original color is
#73FFC2, and Hex
#0DA45C is the 20% darker color. If the color is saturated by 10%, you get
#38DE8F. If the color is desaturated by 10%, the color
#48D08F is obtained.