The hex color #a4f9ef is a light color. The web-safe version is Hex
#99FFFF. A complementary color is
#5B0610. The grayscale version is
#D9D9D9. A 20% lighter version of the original color is
#D7FFFF, and Hex
#71C6BC is the 20% darker color. If the color is saturated by 10%, you get
#9FFCF1. If the color is desaturated by 10%, the color
#A9F6ED is obtained.