The hex color #40e4a9 is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#BF1B56. The grayscale version is
#9A9A9A. A 20% lighter version of the original color is
#73FFDC, and Hex
#0DB176 is the 20% darker color. If the color is saturated by 10%, you get
#37EBAB. If the color is desaturated by 10%, the color
#49DDA7 is obtained.