The hex color #3d9fbd is a light color. The web-safe version is Hex
#3399CC. A complementary color is
#C26042. The grayscale version is
#888888. A 20% lighter version of the original color is
#70D2F0, and Hex
#0A6C8A is the 20% darker color. If the color is saturated by 10%, you get
#35A1C2. If the color is desaturated by 10%, the color
#459DB8 is obtained.