The hex color #40b68d is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#BF4972. The grayscale version is
#818181. A 20% lighter version of the original color is
#73E9C0, and Hex
#0D835A is the 20% darker color. If the color is saturated by 10%, you get
#3ABB8E. If the color is desaturated by 10%, the color
#47B18C is obtained.