The hex color #4f99d0 is a light color. The web-safe version is Hex
#6699CC. A complementary color is
#B0662F. The grayscale version is
#939393. A 20% lighter version of the original color is
#82CCFF, and Hex
#1C669D is the 20% darker color. If the color is saturated by 10%, you get
#489AD6. If the color is desaturated by 10%, the color
#5698CA is obtained.