body {
    background-color: white;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
  }
  
  .container {
    max-width: 900px;
    margin: auto;
  }
  
  h1 {
    background-color: #003366;
    color: white;
    padding: 15px;
    text-align: center;
    margin-bottom: 20px;
  }
  
  form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  form input, form button {
    padding: 10px;
    font-size: 16px;
  }
  
  form button {
    background-color: #003366;
    color: white;
    border: none;
    cursor: pointer;
  }
  
  form button:hover {
    background-color: #002244;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
  }
  
  th, td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: center;
  }
  
  th {
    background-color: #003366;
    color: white;
  }
  
  button.change {
    background-color: orange;
    border: none;
    color: white;
    padding: 5px 10px;
    cursor: pointer;
  }