body {
    font-family: Arial, sans-serif;
    text-align: center;
    padding: 20px;
  }
  
  .hidden {
    display: none;
  }
  
  button {
    margin: 10px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
  }
  
  #question {
    font-size: 24px;
    margin: 20px 0;
  }
  
  input {
    padding: 10px;
    font-size: 16px;
    width: 200px;
  }