The hex color #31aa9c is a light color. The web-safe version is Hex
#339999. A complementary color is
#CE5563. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#64DDCF, and Hex
#007769 is the 20% darker color. If the color is saturated by 10%, you get
#29AF9F. If the color is desaturated by 10%, the color
#39A699 is obtained.