The hex color #644c06 is a dark color. The web-safe version is Hex
#663300. A complementary color is
#9BB3F9. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#977F39, and Hex
#311900 is the 20% darker color. If the color is saturated by 10%, you get
#684E01. If the color is desaturated by 10%, the color
#604A0B is obtained.