body {
    font-family: Arial, sans-serif;
  }
  
  nav {
    margin-bottom: 20px;
  }
  
  .nav-link {
    margin-right: 10px;
    text-decoration: none;
    color: #000;
  }
  
  .nav-link:hover {
    text-decoration: underline;
  }
  
  #app {
    padding: 20px;
    border: 1px solid #ccc;
  }