The hex color #3DA8C0 is a light color. The web-safe version is Hex
#3399CC. A complementary color is
#C2573F. The grayscale version is
#8C8C8C. A 20% lighter version of the original color is
#70DBF3, and Hex
#0A758D is the 20% darker color. If the color is saturated by 10%, you get
#35ABC5. If the color is desaturated by 10%, the color
#45A5BB is obtained.