The hex color #19b4dd is a light color. The web-safe version is Hex
#00CCCC. A complementary color is
#E64B22. The grayscale version is
#8E8E8E. A 20% lighter version of the original color is
#4CE7FF, and Hex
#0081AA is the 20% darker color. If the color is saturated by 10%, you get
#0DB8E5. If the color is desaturated by 10%, the color
#25B0D5 is obtained.