The hex color #289da3 is a dark color. The web-safe version is Hex
#339999. A complementary color is
#D7625C. The grayscale version is
#787878. A 20% lighter version of the original color is
#5BD0D6, and Hex
#006A70 is the 20% darker color. If the color is saturated by 10%, you get
#20A1A7. If the color is desaturated by 10%, the color
#30999F is obtained.