stars.css

@keyframes move-twink-back {
	from {
		background-position: 0 0;
	}
	to {
		background-position: -10000px 5000px;
	}
}
@-webkit-keyframes move-twink-back {
	from {
		background-position: 0 0;
	}
	to {
		background-position: -10000px 5000px;
	}
}
@-moz-keyframes move-twink-back {
	from {
		background-position: 0 0;
	}
	to {
		background-position: -10000px 5000px;
	}
}
@-ms-keyframes move-twink-back {
	from {
		background-position: 0 0;
	}
	to {
		background-position: -10000px 5000px;
	}
}

.stars,
.twinkling {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	width: 100%;
	height: 100%;
	display: block;
}

.stars {
	background: #000
		url(./img/stars.png) repeat
		top center;
	z-index: -1;
}

.twinkling {
	background: transparent
		url(./img/twinkling.png)
		repeat top center;

	-moz-animation: move-twink-back 200s linear infinite;
	-ms-animation: move-twink-back 200s linear infinite;
	-o-animation: move-twink-back 200s linear infinite;
	-webkit-animation: move-twink-back 200s linear infinite;
	animation: move-twink-back 200s linear infinite;
}