The hex color #21cae2 is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#DE351D. The grayscale version is
#9A9A9A. A 20% lighter version of the original color is
#54FDFF, and Hex
#0097AF is the 20% darker color. If the color is saturated by 10%, you get
#15CFE9. If the color is desaturated by 10%, the color
#2DC5DB is obtained.