The hex color #5b818c is a dark color. The web-safe version is Hex
#669999. A complementary color is
#A47E73. The grayscale version is
#787878. A 20% lighter version of the original color is
#8EB4BF, and Hex
#284E59 is the 20% darker color. If the color is saturated by 10%, you get
#58828E. If the color is desaturated by 10%, the color
#5E808A is obtained.