The hex color #57d2d0 is a light color. The web-safe version is Hex
#66CCCC. A complementary color is
#A82D2F. The grayscale version is
#A8A8A8. A 20% lighter version of the original color is
#8AFFFF, and Hex
#249F9D is the 20% darker color. If the color is saturated by 10%, you get
#4FD6D4. If the color is desaturated by 10%, the color
#5FCECC is obtained.