body {
	background-color: #fdf;
}

h1 {
	font-family: Arial, Helvetica, sans-serif;
	text-align: center;
}

#lorry {
	animation: truck 3s infinite steps(1);
}

@keyframes truck {
	0% {
		transform: translateX(50px);
	}

	33% {
		transform: none;
	}

	66% {
		transform: translateX(-50px);
	}
}