popup.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Slack Custom Button Extension</title>
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
</head>
<body>
  <div style="min-width: 300px;margin-bottom: 30px;">
    <div class="container mt-3">
      <div class="row">
        <div class="col">
          <label for="openai-token" class="form-label">OpenAI API Token:</label>
          <input type="text" class="form-control" id="openai-token" placeholder="Enter your OpenAI API Token">
        </div>
      </div>
    </div>
  </div>
  <script src="popup.js"></script>
</body>
</html>