The hex color #4dd9fb is a light color. The web-safe version is Hex
#66CCFF. A complementary color is
#B22604. The grayscale version is
#B6B6B6. A 20% lighter version of the original color is
#80FFFF, and Hex
#1AA6C8 is the 20% darker color. If the color is saturated by 10%, you get
#43DDFF. If the color is desaturated by 10%, the color
#57D5F4 is obtained.