body {
  font-family: Arial, sans-serif;
  background-color: #222;
  color: #eee;
  margin: 0;
  padding: 20px;
}
header, footer {
  background-color: #111;
  padding: 10px;
  text-align: center;
}
nav ul {
  list-style-type: none;
  padding: 0;
  text-align: center;
}
nav ul li {
  display: inline-block;
  margin: 0 15px;
}
nav ul li a {
  color: #2a7ae2;
  text-decoration: none;
  font-weight: bold;
}
nav ul li a:hover {
  text-decoration: underline;
}