body {
    font-family: Arial, sans-serif;
    text-align: center;
    padding: 2rem;
    background-color: #f7f7f7;
  }
  
  main {
    background: white;
    padding: 2rem;
    max-width: 400px;
    margin: auto;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  }
  
  input, button {
    padding: 0.5rem;
    margin: 1rem 0;
    width: 80%;
    font-size: 1rem;
  }