The hex color #d5303c is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#2ACFC3. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#FF636F, and Hex
#A20009 is the 20% darker color. If the color is saturated by 10%, you get
#E02A37. If the color is desaturated by 10%, the color
#CA3641 is obtained.