#payment-form {
  max-width: 500px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

#card-element {
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 4px;
  background: #fff;
}

#submit {
  background-color: #5469d4;
  color: white;
  padding: 12px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}