.fire {
	background-image: url(noise.jpg), url(noise.jpg), linear-gradient(#fff, #999);
	background-blend-mode: difference, difference, normal;
	filter: sepia(1) contrast(6);
	animation: sliding 5s linear infinite;
}

@keyframes sliding {
	from { background-position: 1536px 9216px, 0 7168px, 0 0; }
	to   { background-position: 512px 0, 1024px 0, 0 0; }
}