The hex color #57b4dd is a light color. The web-safe version is Hex
#66CCCC. A complementary color is
#A84B22. The grayscale version is
#A3A3A3. A 20% lighter version of the original color is
#8AE7FF, and Hex
#2481AA is the 20% darker color. If the color is saturated by 10%, you get
#4FB6E3. If the color is desaturated by 10%, the color
#5FB2D7 is obtained.