The hex color #4fdcf4 is a light color. The web-safe version is Hex
#66CCFF. A complementary color is
#B0230B. The grayscale version is
#B5B5B5. A 20% lighter version of the original color is
#82FFFF, and Hex
#1CA9C1 is the 20% darker color. If the color is saturated by 10%, you get
#45E0FA. If the color is desaturated by 10%, the color
#59D8EE is obtained.