body {
  font-family: monospace;
  background-color: #111;
  color: #eee;
  margin: 0;
  padding: 0;
}
header {
  background-color: #222;
  padding: 1rem;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
}
nav ul li {
  margin: 0 1rem;
}
nav ul li a {
  color: #ccc;
  text-decoration: none;
}
main {
  padding: 2rem;
}
footer {
  background-color: #222;
  text-align: center;
  padding: 1rem;
}