The hex color #540e2e is a dark color. The web-safe version is Hex
#660033. A complementary color is
#ABF1D1. The grayscale version is
#303030. A 20% lighter version of the original color is
#874161, and Hex
#210000 is the 20% darker color. If the color is saturated by 10%, you get
#580B2E. If the color is desaturated by 10%, the color
#50112E is obtained.