The hex color #586a7c is a dark color. The web-safe version is Hex
#666666. A complementary color is
#A79583. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#8B9DAF, and Hex
#253749 is the 20% darker color. If the color is saturated by 10%, you get
#566A7E. If the color is desaturated by 10%, the color
#5A6A7A is obtained.