The hex color #3f613c is a dark color. The web-safe version is Hex
#336633. A complementary color is
#C09EC3. The grayscale version is
#494949. A 20% lighter version of the original color is
#72946F, and Hex
#0C2E09 is the 20% darker color. If the color is saturated by 10%, you get
#3E633B. If the color is desaturated by 10%, the color
#405F3D is obtained.