The hex color #648e3c is a dark color. The web-safe version is Hex
#669933. A complementary color is
#9B71C3. The grayscale version is
#656565. A 20% lighter version of the original color is
#97C16F, and Hex
#315B09 is the 20% darker color. If the color is saturated by 10%, you get
#649238. If the color is desaturated by 10%, the color
#648A40 is obtained.