img, canvas {
		-ms-interpolation-mode: nearest-neighbor;
		image-rendering: -webkit-optimize-contrast;
		image-rendering: -moz-crisp-edges;
		image-rendering: -o-pixelated;
		image-rendering: pixelated;
	}
	#img-a, div {
		position: relative;
	}
	#img-b {
		position: absolute;
	}
	#img-b.overlay {
		left: 0px;
		transition: left 2s linear;
	}

	#img-b.separate {
		left: 420px;
		transition: left 2s linear;
	}