The hex color #40f39f is a light color. The web-safe version is Hex
#33FF99. A complementary color is
#BF0C60. The grayscale version is
#9B9B9B. A 20% lighter version of the original color is
#73FFD2, and Hex
#0DC06C is the 20% darker color. If the color is saturated by 10%, you get
#37FC9F. If the color is desaturated by 10%, the color
#49EA9F is obtained.