The hex color #3d9e7f is a dark color. The web-safe version is Hex
#339966. A complementary color is
#C26180. The grayscale version is
#737373. A 20% lighter version of the original color is
#70D1B2, and Hex
#0A6B4C is the 20% darker color. If the color is saturated by 10%, you get
#38A280. If the color is desaturated by 10%, the color
#429A7E is obtained.