The hex color #66ba9c is a light color. The web-safe version is Hex
#66CC99. A complementary color is
#994563. The grayscale version is
#949494. A 20% lighter version of the original color is
#99EDCF, and Hex
#338769 is the 20% darker color. If the color is saturated by 10%, you get
#61BE9D. If the color is desaturated by 10%, the color
#6BB69B is obtained.