The hex color #57A8B5 is a light color. The web-safe version is Hex
#6699CC. A complementary color is
#A8574A. The grayscale version is
#919191. A 20% lighter version of the original color is
#8ADBE8, and Hex
#247582 is the 20% darker color. If the color is saturated by 10%, you get
#51AAB9. If the color is desaturated by 10%, the color
#5DA6B1 is obtained.