The hex color #d33e37 is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#2CC1C8. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#FF716A, and Hex
#A00B04 is the 20% darker color. If the color is saturated by 10%, you get
#DD3932. If the color is desaturated by 10%, the color
#C9433C is obtained.