body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
  }
  
  .container {
    max-width: 800px;
    margin: 50px auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  }
  
  h1 {
    text-align: center;
    color: #333;
  }
  
  .form {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  label {
    margin-top: 10px;
    font-size: 14px;
    color: #555;
  }
  
  input {
    margin: 5px 0 15px;
    padding: 10px;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid #ddd;
    border-radius: 4px;
  }
  
  button {
    padding: 10px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  button:hover {
    background-color: #45a049;
  }
  
  #result {
    margin-top: 20px;
    text-align: center;
    font-size: 16px;
    color: #333;
  }