The hex color #65d8ff is a light color. The web-safe version is Hex
#66CCFF. A complementary color is
#9A2700. The grayscale version is
#BFBFBF. A 20% lighter version of the original color is
#98FFFF, and Hex
#32A5CC is the 20% darker color. If the color is saturated by 10%, you get
#5CDBFF. If the color is desaturated by 10%, the color
#6ED5F9 is obtained.