The hex color #1b788a is a dark color. The web-safe version is Hex
#336699. A complementary color is
#E48775. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#4EABBD, and Hex
#004557 is the 20% darker color. If the color is saturated by 10%, you get
#147B8E. If the color is desaturated by 10%, the color
#227686 is obtained.