The hex color #3a99df is a light color. The web-safe version is Hex
#3399CC. A complementary color is
#C56620. The grayscale version is
#919191. A 20% lighter version of the original color is
#6DCCFF, and Hex
#0766AC is the 20% darker color. If the color is saturated by 10%, you get
#319AE7. If the color is desaturated by 10%, the color
#4398D7 is obtained.