The hex color #3d726d is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C28D92. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#70A5A0, and Hex
#0A3F3A is the 20% darker color. If the color is saturated by 10%, you get
#3A746E. If the color is desaturated by 10%, the color
#40706C is obtained.