The hex color #639a1c is a dark color. The web-safe version is Hex
#669933. A complementary color is
#9C65E3. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#96CD4F, and Hex
#306700 is the 20% darker color. If the color is saturated by 10%, you get
#64A015. If the color is desaturated by 10%, the color
#629423 is obtained.