The hex color #83c9b5 is a light color. The web-safe version is Hex
#99CCCC. A complementary color is
#7C364A. The grayscale version is
#ABABAB. A 20% lighter version of the original color is
#B6FCE8, and Hex
#509682 is the 20% darker color. If the color is saturated by 10%, you get
#7FCCB6. If the color is desaturated by 10%, the color
#87C6B4 is obtained.