body {
    margin: 0;
    font-family: Arial, sans-serif;
  }
  
  .navbar {
    display: flex;
    background-color: #333;
    overflow: hidden;
  }
  
  .navbar a {
    color: white;
    padding: 14px 20px;
    text-decoration: none;
    text-align: center;
  }
  
  .navbar a:hover {
    background-color: #575757;
  }
  
  .navbar a.active {
    background-color: #4CAF50;
  }
  
  @media screen and (max-width: 600px) {
    .navbar {
      flex-direction: column;
    }
  }