body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
  }
  
  header {
    background-color: #222;
    color: white;
    padding: 1em;
  }
  
  nav a {
    color: white;
    margin: 0 1em;
    text-decoration: none;
  }
  
  main {
    padding: 2em;
  }
  
  footer {
    text-align: center;
    padding: 1em;
    background-color: #f4f4f4;
  }