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  <title>CSS Variables (Custom Properties)</title>
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  <header class="page-header">
    <h1>CSS Variables (Custom Properties)</h1>
    <p class="lead">Reusable, themable values with --name and var().</p>
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  <main class="demo">
    <div class="card-v">
      <h3>Themable Card</h3>
      <p>Change one variable to restyle everything.</p>
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