The hex color #4d578c is a dark color. The web-safe version is Hex
#666699. A complementary color is
#B2A873. The grayscale version is
#656565. A 20% lighter version of the original color is
#808ABF, and Hex
#1A2459 is the 20% darker color. If the color is saturated by 10%, you get
#4B5690. If the color is desaturated by 10%, the color
#4F5888 is obtained.