The hex color #42ffdd is a light color. The web-safe version is Hex
#33FFCC. A complementary color is
#BD0022. The grayscale version is
#B5B5B5. A 20% lighter version of the original color is
#75FFFF, and Hex
#0FCCAA is the 20% darker color. If the color is saturated by 10%, you get
#37FFE1. If the color is desaturated by 10%, the color
#4DF8D9 is obtained.