HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>outline vs border</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    div {
      margin: 0 0 16px;
      max-width: 16rem;
      padding: 12px;
      background: #f8fafc;
      font-weight: 700;
    }

    .with-border {
      border: 6px solid #2563eb;
    }

    .with-outline {
      outline: 6px solid #2563eb;
      border: 1px solid #cbd5e1;
    }
  </style>
</head>
<body>
  <p>Both rings are 6px thick. Only the <strong>border</strong> increases the box’s outer size.</p>
  <div class="with-border">Border grows the box</div>
  <div class="with-outline">Outline does not</div>
</body>
</html>

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CSS outline Property — Outline vs Border