The hex color #64d4e8 is a light color. The web-safe version is Hex
#66CCFF. A complementary color is
#9B2B17. The grayscale version is
#B5B5B5. A 20% lighter version of the original color is
#97FFFF, and Hex
#31A1B5 is the 20% darker color. If the color is saturated by 10%, you get
#5CD7ED. If the color is desaturated by 10%, the color
#6CD1E3 is obtained.