页面的head部分，需引入页面的样式文件，代码如下：

<link type="text/css" rel="stylesheet" href="css/style.css">

页面的body部分，需设置好月亮、云和星星的容器，代码如下：

<div class="main">
  <div class="moon-group">
    <div class="moon"></div>
    <div class="moon-shadow"></div>
  </div>
  <div class="cloud-group-1">
    <div class="cloud cloud-1"></div>
    <div class="cloud-shadow"></div>
  </div>
  <div class="cloud-group-2">
    <div class="cloud cloud-2"></div>
    <div class="cloud-shadow"></div>
  </div>
  <div class="stars">
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
    <div class="star"></div>
  </div>
</div>

页面的底部，远程调用jQuery库和其余两个JS文件，代码如下：

<script src='https://code.jquery.com/jquery-1.11.3.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/TweenMax.min.js'></script>
<script type="text/javascript" src="js/index.js"></script>