<!DOCTYPE html>
<!-- https://www.youtube.com/watch?v=W3eJWpvIl0g -->
<!-- https://chinese.yabla.com/vocabulary.php -->
<html>
<head>
  <style media="screen" type="text/css">
    html {
      font-family: sans-serif, FangSong, "仿宋", STKaiti, "华文楷体";
      font-size: xx-large;
      color: white;
      margin-top:0px;
      margin-bottom:0px;
      margin-right:0px;
      margin-left:8px;
    }
    .flip3D {
      width: 240px;
      height: 200px;
      margin: 10px;
      float: left;
    }
    .flip3D > .front {
      position: absolute;
      background: lightslategray;
      width: 240px;
      height: 200px;
      border-radius: 7px;
      transform: perspective(600px) rotateY(0deg);
      -webkit-transform: perspective(600px) rotateY(0deg);
      -moz-transform: perspective(600px) rotateY(0deg);
      -o-transform: perspective(600px) rotateY(0deg);
      transition: transform .5s linear 0s;
      -webkit-transition: transform .5s linear 0s;
      -moz-transition: transform .5s linear 0s;
      -o-transition: transform .5s linear 0s;
      backface-visibility: hidden;
      -webkit-backface-visibility: hidden;
      -moz-backface-visibility: hidden;
      -o-backface-visibility: hidden;
    }
    .flip3D > .back {
      position: absolute;
      background: Salmon;
      width: 240px;
      height: 200px;
      border-radius: 7px;
      transform: perspective(600px) rotateY(180deg);
      -webkit-transform: perspective(600px) rotateY(180deg);
      -moz-transform: perspective(600px) rotateY(180deg);
      -o-transform: perspective(600px) rotateY(180deg);
      transition: transform .5s linear 0s;
      -webkit-transition: transform .5s linear 0s;
      -moz-transition: transform .5s linear 0s;
      -o-transition: transform .5s linear 0s;
      backface-visibility: hidden;
      -webkit-backface-visibility: hidden;
      -moz-backface-visibility: hidden;
      -o-backface-visibility: hidden;
    }
    .flip3D:hover > .front {
      transform: perspective(600px) rotateY(-180deg);
      -webkit-transform: perspective(600px) rotateY(-180deg);
      -moz-transform: perspective(600px) rotateY(-180deg);
      -o-transform: perspective(600px) rotateY(-180deg);
    }
    .flip3D:hover > .back {
      transform: perspective(600px) rotateY(0deg);
      -webkit-transform: perspective(600px) rotateY(0deg);
      -moz-transform: perspective(600px) rotateY(0deg);
      -o-transform: perspective(600px) rotateY(0deg);
    }
    .chinese {
      text-align: center;
      font-size: 140%;
      font-weight: 900;
      margin-top:-40px;
    }
    .pinyin {
      text-align: center;
      font-size: 90%;
      margin-top:-50px;
    }
    .chinese_long {
      text-align: center;
      font-size: 122%;
      font-weight: 900;
      margin-top:-20px;
    }
    .pinyin_long {
      text-align: center;
      font-size: 90%;
      margin-top:-40px;
    }
    div {
      text-align: center;
    }
  </style>
</head>

<body>
  <div class="flip3D">
    <div class="back"><h3>green</h3></div>
    <div class="front"><div class="chinese"><h1>绿色</h1></div><div class="pinyin"><h3>lǜ&thinsp;sè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>brown</h3></div>
    <div class="front"><div class="chinese"><h1>褐色</h1></div><div class="pinyin"><h3>hè&thinsp;sè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>blue</h3></div>
    <div class="front"><div class="chinese"><h1>蓝色</h1></div><div class="pinyin"><h3>lán&thinsp;sè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>black</h3></div>
    <div class="front"><div class="chinese"><h1>黑色</h1></div><div class="pinyin"><h3>hēi&thinsp;sè</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>red</h3></div>
    <div class="front"><div class="chinese"><h1>红色</h1></div><div class="pinyin"><h3>hóng&thinsp;sè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>purple</h3></div>
    <div class="front"><div class="chinese"><h1>紫色</h1></div><div class="pinyin"><h3>zǐ&thinsp;sè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>pink</h3></div>
    <div class="front"><div class="chinese_long"><h1>粉红色</h1></div><div class="pinyin_long"><h3>fěn&thinsp;hóng&thinsp;sè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>gray</h3></div>
    <div class="front"><div class="chinese"><h1>灰色</h1></div><div class="pinyin"><h3>huī&thinsp;sè</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>yellow</h3></div>
    <div class="front"><div class="chinese"><h1>黄色</h1></div><div class="pinyin"><h3>huáng&thinsp;sè</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>white</h3></div>
    <div class="front"><div class="chinese"><h1>白色</h1></div><div class="pinyin"><h3>bái&thinsp;sè</h3></div></div>
  </div>

<!--
-->

</body>
</html>