The hex color #40b9cd is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#BF4632. The grayscale version is
#979797. A 20% lighter version of the original color is
#73ECFF, and Hex
#0D869A is the 20% darker color. If the color is saturated by 10%, you get
#37BCD2. If the color is desaturated by 10%, the color
#49B6C8 is obtained.