The hex color #4d180c is a dark color. The web-safe version is Hex
#660000. A complementary color is
#B2E7F3. The grayscale version is
#262626. A 20% lighter version of the original color is
#804B3F, and Hex
#1A0000 is the 20% darker color. If the color is saturated by 10%, you get
#511709. If the color is desaturated by 10%, the color
#49190F is obtained.