HTML Code

<!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-width em</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .responsive-rule {
      font-size: 1rem;
      column-count: 3;
      column-gap: 1.5em;
      column-rule-width: 0.1em;
      column-rule-style: solid;
      column-rule-color: #94a3b8;
      text-align: justify;
    }
  </style>
</head>
<body>
  <h1>Responsive em column rule</h1>
  <div class="responsive-rule">
    Three columns with an em-scaled rule width. 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-width Property - em-Based Width