HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>border-image-source: linear-gradient</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 {
      border: 16px solid;
      border-image-source: linear-gradient(135deg, #2563eb, #dc2626);
      border-image-slice: 1;
      padding: 12px;
      background: #fff;
      text-align: center;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <p>A <strong>linear-gradient()</strong> is a valid source. <strong>border-image-slice: 1</strong> is a simple cut for gradient frames.</p>
  <div>gradient source</div>
</body>
</html>

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CSS border-image-source Property — gradient