The hex color #51a6aa is a light color. The web-safe version is Hex
#669999. A complementary color is
#AE5955. The grayscale version is
#8B8B8B. A 20% lighter version of the original color is
#84D9DD, and Hex
#1E7377 is the 20% darker color. If the color is saturated by 10%, you get
#4BA9AD. If the color is desaturated by 10%, the color
#57A3A7 is obtained.