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    html {
      font-family: sans-serif, FangSong, "仿宋", STKaiti, "华文楷体";
      font-size: xx-large;
      color: white;
      margin-top:0px;
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      margin-right:0px;
      margin-left:8px;
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      width: 240px;
      height: 200px;
      margin: 10px;
      float: left;
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    .flip3D > .front {
      position: absolute;
      background: lightslategray;
      width: 240px;
      height: 200px;
      border-radius: 7px;
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    .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);
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      backface-visibility: hidden;
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    .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);
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    .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);
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    .chinese {
      text-align: center;
      font-size: 140%;
      font-weight: 900;
      margin-top:-40px;
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    .pinyin {
      text-align: center;
      font-size: 90%;
      margin-top:-50px;
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    .chinese_long {
      text-align: center;
      font-size: 122%;
      font-weight: 900;
      margin-top:-20px;
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    .pinyin_long {
      text-align: center;
      font-size: 90%;
      margin-top:-40px;
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    .chinese_xlong {
      text-align: center;
      font-size: 90%;
      font-weight: 900;
      margin-top: 15px;
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    .pinyin_xlong {
      text-align: center;
      font-size: 95%;
      margin-top:-5px;
    }
    div {
      text-align: center;
    }
  </style>
</head>

<body>
  <div class="flip3D">
    <div class="back"><h3>yesterday</h3></div>
    <div class="front"><div class="chinese"><h1>昨天</h1></div><div class="pinyin"><h3>zuó&thinsp;tiān</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>today</h3></div>
    <div class="front"><div class="chinese"><h1>今天</h1></div><div class="pinyin"><h3>jīn&thinsp;tiān</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>tomorrow</h3></div>
    <div class="front"><div class="chinese"><h1>明天</h1></div><div class="pinyin"><h3>míng&thinsp;tiān</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>now</h3></div>
    <div class="front"><div class="chinese"><h1>现在</h1></div><div class="pinyin"><h3>xiàn&thinsp;zài</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>then</h3></div>
    <div class="front"><div class="chinese"><h1>然后</h1></div><div class="pinyin"><h3>rán&thinsp;hòu</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>later</h3></div>
    <div class="front"><div class="chinese"><h1>后来</h1></div><div class="pinyin"><h3>hòu&thinsp;lái</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>tonight</h3></div>
    <div class="front"><div class="chinese"><h1>今晚</h1></div><div class="pinyin"><h3>jīn&thinsp;wǎn</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>right now</h3></div>
    <div class="front"><div class="chinese"><h1>马上</h1></div><div class="pinyin"><h3>mǎ&thinsp;shàng</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>immediately, right now</h3></div>
    <div class="front"><div class="chinese"><h1>立即</h1></div><div class="pinyin"><h3>lì&thinsp;jí</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>last night</h3></div>
    <div class="front"><div class="chinese"><h1>昨晚</h1></div><div class="pinyin"><h3>zuó&thinsp;wǎn</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>this morning</h3></div>
    <div class="front"><div class="chinese"><h1>今早</h1></div><div class="pinyin"><h3>jīn&thinsp;zǎo</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>next week</h3></div>
    <div class="front"><div class="chinese"><h1>下周</h1></div><div class="pinyin"><h3>xià&thinsp;zhōu</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>already</h3></div>
    <div class="front"><div class="chinese"><h1>已经</h1></div><div class="pinyin"><h3>yǐ&thinsp;jīng</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>recently</h3></div>
    <div class="front"><div class="chinese"><h1>最近</h1></div><div class="pinyin"><h3>zuì&thinsp;jìn</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>lately</h3></div>
    <div class="front"><div class="chinese"><h1>近来</h1></div><div class="pinyin"><h3>jìn&thinsp;lái</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>soon</h3></div>
    <div class="front"><div class="chinese"><h1>不久</h1></div><div class="pinyin"><h3>bù&thinsp;jiǔ</h3></div></div>
  </div>

  <div class="flip3D">
    <div class="back"><h3>still</h3></div>
    <div class="front"><div class="chinese"><h1>仍</h1></div><div class="pinyin"><h3>réng</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>yet</h3></div>
    <div class="front"><div class="chinese"><h1>还</h1></div><div class="pinyin"><h3>hái</h3></div></div>
  </div>
  <div class="flip3D">
    <div class="back"><h3>ago</h3></div>
    <div class="front"><div class="chinese"><h1>以前</h1></div><div class="pinyin"><h3>yǐ&thinsp;qián</h3></div></div>
  </div>

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