The hex color #63973c is a dark color. The web-safe version is Hex
#669933. A complementary color is
#9C68C3. The grayscale version is
#676767. A 20% lighter version of the original color is
#96CA6F, and Hex
#306409 is the 20% darker color. If the color is saturated by 10%, you get
#639C38. If the color is desaturated by 10%, the color
#639240 is obtained.