The hex color #99ddc3 is a light color. The web-safe version is Hex
#99CCCC. A complementary color is
#66223C. The grayscale version is
#BEBEBE. A 20% lighter version of the original color is
#CCFFF6, and Hex
#66AA90 is the 20% darker color. If the color is saturated by 10%, you get
#95E0C4. If the color is desaturated by 10%, the color
#9DDAC2 is obtained.