The hex color #51a6ec is a light color. The web-safe version is Hex
#6699FF. A complementary color is
#AE5913. The grayscale version is
#A1A1A1. A 20% lighter version of the original color is
#84D9FF, and Hex
#1E73B9 is the 20% darker color. If the color is saturated by 10%, you get
#49A7F4. If the color is desaturated by 10%, the color
#59A6E5 is obtained.