The hex color #4f90a8 is a dark color. The web-safe version is Hex
#669999. A complementary color is
#B06F57. The grayscale version is
#828282. A 20% lighter version of the original color is
#82C3DB, and Hex
#1C5D75 is the 20% darker color. If the color is saturated by 10%, you get
#4A91AC. If the color is desaturated by 10%, the color
#548FA4 is obtained.