HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>border-image-outset: 1.5</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

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

    .stage {
      padding: 28px;
      background: #f1f5f9;
      border: 2px dashed #64748b;
    }

    div {
      border: 8px solid;
      border-image: linear-gradient(to right, #7c3aed, #2563eb) 1;
      border-image-outset: 1.5;
      padding: 12px;
      background: #fff;
      text-align: center;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <p>Border width is 8px. <strong>border-image-outset: 1.5</strong> means 1.5 × 8px = 12px of outset on each side.</p>
  <div class="stage">
    <div>1.5 × border width</div>
  </div>
</body>
</html>

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CSS border-image-outset Property — number