The hex color #3da9c3 is a light color. The web-safe version is Hex
#3399CC. A complementary color is
#C2563C. The grayscale version is
#8E8E8E. A 20% lighter version of the original color is
#70DCF6, and Hex
#0A7690 is the 20% darker color. If the color is saturated by 10%, you get
#35ACC8. If the color is desaturated by 10%, the color
#45A6BE is obtained.