The hex color #f13d3e is a dark color. The web-safe version is Hex
#FF3333. A complementary color is
#0EC2C1. The grayscale version is
#797979. A 20% lighter version of the original color is
#FF7071, and Hex
#BE0A0B is the 20% darker color. If the color is saturated by 10%, you get
#FD3738. If the color is desaturated by 10%, the color
#E54344 is obtained.