The hex color #00664c is a dark color. The web-safe version is Hex
#006633. A complementary color is
#FF99B3. The grayscale version is
#3B3B3B. A 20% lighter version of the original color is
#33997F, and Hex
#003319 is the 20% darker color. If the color is saturated by 10%, you get
#006A4E. If the color is desaturated by 10%, the color
#06624A is obtained.