The hex color #28666f is a dark color. The web-safe version is Hex
#336666. A complementary color is
#D79990. The grayscale version is
#545454. A 20% lighter version of the original color is
#5B99A2, and Hex
#00333C is the 20% darker color. If the color is saturated by 10%, you get
#246872. If the color is desaturated by 10%, the color
#2C646C is obtained.