The hex color #3d9d9f is a light color. The web-safe version is Hex
#339999. A complementary color is
#C26260. The grayscale version is
#7E7E7E. A 20% lighter version of the original color is
#70D0D2, and Hex
#0A6A6C is the 20% darker color. If the color is saturated by 10%, you get
#37A0A2. If the color is desaturated by 10%, the color
#439A9C is obtained.