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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS column-rule-color theme</title>
  <style>
    :root {
      --rule-color: #0ea5e9;
    }

    body {
      font-family: sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .themed {
      column-count: 2;
      column-gap: 2rem;
      column-rule: 2px solid;
      column-rule-color: var(--rule-color);
      text-align: justify;
    }
  </style>
</head>
<body>
  <h1>Themed column rule color</h1>
  <div class="themed">
    Two columns with a sky-blue rule from a CSS variable. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </div>
</body>
</html>

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CSS column-rule-color Property - CSS Variable Theme