The hex color #51526c is a dark color. The web-safe version is Hex
#666666. A complementary color is
#AEAD93. The grayscale version is
#5A5A5A. A 20% lighter version of the original color is
#84859F, and Hex
#1E1F39 is the 20% darker color. If the color is saturated by 10%, you get
#50516E. If the color is desaturated by 10%, the color
#52536A is obtained.