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      width: 240px;
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      transform: perspective(600px) rotateY(180deg);
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    .flip3D:hover > .back {
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    .chinese {
      text-align: center;
      font-size: 140%;
      font-weight: 900;
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    .pinyin {
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<body>
  <div class="flip3D">
    <div class="back"><h3>foot</h3></div>
    <div class="front"><div class="chinese"><h1>脚</h1></div><div class="pinyin"><h3>jiǎo</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>face</h3></div>
    <div class="front"><div class="chinese"><h1>脸</h1></div><div class="pinyin"><h3>liǎn</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>eye</h3></div>
    <div class="front"><div class="chinese"><h1>眼睛</h1></div><div class="pinyin"><h3>yǎn&thinsp;jīng</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>arm</h3></div>
    <div class="front"><div class="chinese"><h1>胳膊</h1></div><div class="pinyin"><h3>gē&thinsp;bo</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>nose</h3></div>
    <div class="front"><div class="chinese"><h1>鼻子</h1></div><div class="pinyin"><h3>bí&thinsp;zi</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>mouth</h3></div>
    <div class="front"><div class="chinese"><h1>觜</h1></div><div class="pinyin"><h3>zuǐ</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>leg</h3></div>
    <div class="front"><div class="chinese"><h1>腿</h1></div><div class="pinyin"><h3>tuǐ</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>hand</h3></div>
    <div class="front"><div class="chinese"><h1>手</h1></div><div class="pinyin"><h3>shǒu</h3></div></div>
  </div>

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