<style>
    body { font-family: Arial, sans-serif; padding: 20px; }
    form { max-width: 400px; margin: auto; }
    input, textarea, button { width: 100%; margin: 10px 0; padding: 10px; box-sizing: border-box; }
    button { background-color: #25D366; color: white; border: none; cursor: pointer; }
    button:disabled { background-color: #888; cursor: not-allowed; }
    button:hover:not(:disabled) { background-color: #128C7E; }
    .success-message {
      background-color: #d4edda;
      color: #155724;
      padding: 10px;
      margin-bottom: 15px;
      border: 1px solid #c3e6cb;
      display: none;
    }
  </style>