body {
  font-family: Georgia, serif;
  max-width: 900px;
  overflow-wrap: break-word;
  margin: 0 auto;
  font-size: 20px;
}

ul.tabs {
  list-style-type: none;
  margin: 0;
  padding: 10px;
  overflow: hidden;
  background-color: #c5d9ed;
}

ul.tabs li {
  float: left;
}

ul.tabs li a {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  font-size: 20px;
}

ul.tabs li.active a {
  background-color: #f0f6fc;
}

footer {
  text-align: center;
  padding: 10px;
  background-color: #c5d9ed;
}