The hex color #42fdf5 is a light color. The web-safe version is Hex
#33FFFF. A complementary color is
#BD020A. The grayscale version is
#BCBCBC. A 20% lighter version of the original color is
#75FFFF, and Hex
#0FCAC2 is the 20% darker color. If the color is saturated by 10%, you get
#36FFFB. If the color is desaturated by 10%, the color
#4EF7EF is obtained.