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<!DOCTYPE html>
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<html>
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<head>
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  <meta charset="utf-8">
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  <meta name="viewport" content="width=device-width">
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  <title>Card flip</title>
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  <style>
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    *{
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      margin:0;
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      padding:0;
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    }
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    .card {
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      margin: 100px auto 0;
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      width: 400px;
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      height: 600px;
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      perspective: 1200px;
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    }
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    .card_inner{
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      width:100%;
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      height:100%;
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      transition: transform 1s;
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      transform-style: preserve-3d;
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      position:relative;
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    }
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    .card_inner.is-flipped{
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      transform: rotateY(180deg);
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    }
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    .card_face{
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      position:absolute;
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      width:100%;
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      height:100%;
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      -webkit-backface-visibility: hidden;
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      backface-visibility: hidden;
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      overflow: hidden;
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      border-radius: 16px;
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      box-shadow: 0 3px 18px 3px rgba(0,0,0,.2);
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    }
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    .card_face--front{
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      background-color:orange;
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      display:flex;
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      align-items: center;
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      justify-content: center;
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    }
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    .card_face--back{
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      background-color:yellow;
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      display:flex;
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      align-items: center;
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      justify-content: center;
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      transform: rotateY(180deg);
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    }
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    button{
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      padding:.4em;
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      cursor:pointer;
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    }
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  </style>
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</head>
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<body>
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  <div class="card">
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    <div class="card_inner">
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      <div class="card_face card_face--front">
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        <h2>FRONT</h2>
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        <button class="button">BACK</button>
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      </div>
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      <div class="card_face card_face--back">
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        <h2>BACK</h2>
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    card.addEventListener('click', function () {
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        <button class="button">FRONT</button>
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      card.classList.toggle('is-flipped');
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    })
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  </div>
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  <script>
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    const card = document.querySelector('.card_inner');
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    const buttons = document.getElementsByClassName('button');
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    Array.from(buttons).forEach(function(button) {
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      button.addEventListener('click', function () {
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        card.classList.toggle('is-flipped');
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      })
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    });
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  </script>
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</body>
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</html>