body {
    font-family: Arial, sans-serif;
  }
  
  main {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
  }
  
  form {
    margin-top: 20px;
  }
  
  button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #0056b3;
  }
  
  #card-element {
    margin-top: 10px;
    border: 1px solid #ccc;
    padding: 10px;
    border-radius: 5px;
  }
  
  #card-errors {
    color: red;
    margin-top: 10px;
  }