HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>card wrapInner demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 480px; }
    .card { border: 1px solid #cbd5e1; border-radius: 8px; background: #f8fafc; }
    .card-body { padding: 12px; }
    h4 { margin: 0 0 6px; }
    button { margin-top: 12px; padding: 10px 16px; background: #059669; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <div class="card">
    <h4>Card title</h4>
    <p>Card content goes here.</p>
  </div>
  <button type="button">Add .card-body inside</button>
  <p id="hint">$(".card").wrapInner("&lt;div class='card-body'&gt;")</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("button").on("click", function() {
      $(".card").wrapInner("<div class='card-body'></div>");
      $("#hint").text(".card tag unchanged — inner div wraps h4 and p together.");
    });
  </script>
</body>
</html>

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jQuery .wrapInner() — card body shell (Try It)