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<body>
  <div class="flip3D">
    <div class="back"><h3>moon</h3></div>
    <div class="front"><div class="chinese"><h1>月</h1></div><div class="pinyin"><h3>yuè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>ice</h3></div>
    <div class="front"><div class="chinese"><h1>冰</h1></div><div class="pinyin"><h3>bīng</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>cold</h3></div>
    <div class="front"><div class="chinese"><h1>冷</h1></div><div class="pinyin"><h3>lěng</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>cloud</h3></div>
    <div class="front"><div class="chinese"><h1>云</h1></div><div class="pinyin"><h3>yún</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>sun</h3></div>
    <div class="front"><div class="chinese"><h1>太阳</h1></div><div class="pinyin"><h3>tài&thinsp;yáng</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>snow</h3></div>
    <div class="front"><div class="chinese"><h1>雪</h1></div><div class="pinyin"><h3>xuě</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>sky</h3></div>
    <div class="front"><div class="chinese"><h1>天</h1></div><div class="pinyin"><h3>tiān</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>rain</h3></div>
    <div class="front"><div class="chinese"><h1>雨</h1></div><div class="pinyin"><h3>yǔ</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>world</h3></div>
    <div class="front"><div class="chinese"><h1>世界</h1></div><div class="pinyin"><h3>shì&thinsp;jiè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>wind</h3></div>
    <div class="front"><div class="chinese"><h1>风</h1></div><div class="pinyin"><h3>fēng</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>umbrella</h3></div>
    <div class="front"><div class="chinese"><h1>雨伞</h1></div><div class="pinyin"><h3>yǔ&thinsp;sǎn</h3></div></div>
  </div>

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