The hex color #3d6d5f is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C292A0. The grayscale version is
#585858. A 20% lighter version of the original color is
#70A092, and Hex
#0A3A2C is the 20% darker color. If the color is saturated by 10%, you get
#3A6F60. If the color is desaturated by 10%, the color
#406B5E is obtained.