The hex color #99f99c is a light color. The web-safe version is Hex
#99FF99. A complementary color is
#660663. The grayscale version is
#BABABA. A 20% lighter version of the original color is
#CCFFCF, and Hex
#66C669 is the 20% darker color. If the color is saturated by 10%, you get
#96FF99. If the color is desaturated by 10%, the color
#9CF39F is obtained.