#E40303 has the blunt energy of a painted parade sign. It makes an immediate accent against white, black, or a deep violet, so keep it to a button, label, or one strong block.
Tints
#e40303
#e71c1c
#e93535
#ec4f4f
#ef6868
#f28181
#f49a9a
#f7b3b3
#facdcd
#fce6e6
#ffffff
Shadows
#e40303
#cd0303
#b60202
#a00202
#890202
#720202
#5b0101
#440101
#2e0101
#170000