	<div class="cloud-son"></div>
				<div class="cloud-son"></div>
			</div>
			<div class="stars">
				<!-- 所有星星，每一个星星由四个div拼合而成 -->
				<div class="star big">
					<div class="star-son"></div>
					<div class="star-son"></div>
					<div class="star-son"></div>
					<div class="star-son"></div>
				</div>
				<div class="star big">
					<div class="star-son"></div>
					<div class="star-son"></div>
					<div class="star-son"></div>
					<div class="star-son"></div>
				</div