body {
    font-family: Arial, sans-serif;
    margin: 20px;
  }
  
  h1 {
    color: #333;
  }
  
  form {
    display: flex;
    flex-direction: column;
    max-width: 300px;
  }
  
  label {
    margin-top: 10px;
  }
  
  select, button {
    margin-top: 5px;
    padding: 8px;
    font-size: 16px;
  }
  
  button {
    cursor: pointer;
    background-color: #007BFF;
    color: #fff;
    border: none;
  }
  
  button:hover {
    background-color: #0056b3;
  }
  
  #result {
    margin-top: 20px;
    font-size: 20px;
    font-weight: bold;
  }