The hex color #ff3f6b is a dark color. The web-safe version is Hex
#FF3366. A complementary color is
#00C094. The grayscale version is
#8E8E8E. A 20% lighter version of the original color is
#FF729E, and Hex
#CC0C38 is the 20% darker color. If the color is saturated by 10%, you get
#FF3768. If the color is desaturated by 10%, the color
#F4476E is obtained.