The hex color #63786c is a dark color. The web-safe version is Hex
#666666. A complementary color is
#9C8793. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#96AB9F, and Hex
#304539 is the 20% darker color. If the color is saturated by 10%, you get
#62796C. If the color is desaturated by 10%, the color
#64776C is obtained.