The hex color #28e4dd is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#D71B22. The grayscale version is
#A3A3A3. A 20% lighter version of the original color is
#5BFFFF, and Hex
#00B1AA is the 20% darker color. If the color is saturated by 10%, you get
#1CEBE3. If the color is desaturated by 10%, the color
#34DED7 is obtained.