body {
    font-family: Arial, sans-serif;
  }
  
  h1 {
    text-align: center;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
  }
  
  table, th, td {
    border: 1px solid #ddd;
  }
  
  th, td {
    padding: 8px;
    text-align: center;
  }
  
  input[type="text"], input[type="number"] {
    width: 100%;
    padding: 5px;
    box-sizing: border-box;
    text-align: center;
  }
  
  button {
    display: block;
    margin: 0 auto;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #0056b3;
  }