The hex color #99e5ff is a light color. The web-safe version is Hex
#99CCFF. A complementary color is
#661A00. The grayscale version is
#D4D4D4. A 20% lighter version of the original color is
#CCFFFF, and Hex
#66B2CC is the 20% darker color. If the color is saturated by 10%, you get
#93E7FF. If the color is desaturated by 10%, the color
#9FE3FB is obtained.