body {
    font-family: 'arial';
    padding: 0;
    margin: 0;
  }
  img {
    max-width: 99%;
    width: auto;
    height: auto;
  }
  main, header, footer {
    width: 800px;
    max-width: 95%;
    margin-left: auto;
    margin-right: auto;
  }
  footer {
    text-align: center;
    padding: 10px 0 10px 0;
    font-size: 0.5em;
  }
  article {
    margin-bottom: 20px;
  }