The hex color #42b4dd is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#BD4B22. The grayscale version is
#9C9C9C. A 20% lighter version of the original color is
#75E7FF, and Hex
#0F81AA is the 20% darker color. If the color is saturated by 10%, you get
#39B6E4. If the color is desaturated by 10%, the color
#4BB2D6 is obtained.