The hex color #31b2cc is a light color. The web-safe version is Hex
#3399CC. A complementary color is
#CE4D33. The grayscale version is
#909090. A 20% lighter version of the original color is
#64E5FF, and Hex
#007F99 is the 20% darker color. If the color is saturated by 10%, you get
#28B5D2. If the color is desaturated by 10%, the color
#3AAFC6 is obtained.