The hex color #42f7f5 is a light color. The web-safe version is Hex
#33FFFF. A complementary color is
#BD080A. The grayscale version is
#BABABA. A 20% lighter version of the original color is
#75FFFF, and Hex
#0FC4C2 is the 20% darker color. If the color is saturated by 10%, you get
#36FDFB. If the color is desaturated by 10%, the color
#4EF1EF is obtained.