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 caret-color Textarea Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    textarea {
      caret-color: #2563eb;
      width: 100%;
      max-width: 22rem;
      padding: 0.65rem;
      border: 1px solid #cbd5e1;
      border-radius: 0.45rem;
      font-size: 1rem;
      line-height: 1.5;
    }
  </style>
</head>
<body>
  <h1>Textarea with blue caret</h1>
  <textarea rows="4" placeholder="Write your message..."></textarea>
</body>
</html>

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CSS caret-color Property - Textarea Caret Color