body {
    background-color: #f8f9fa;
  }
  .checkout-form {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
  .form-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-align: center;
    font-weight: 600;
  }
  .form-group label {
    font-weight: 500;
  }
  .btn-primary {
    width: 100%;
    padding: 10px;
    font-size: 1.2rem;
  }