body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
}

header {
  background: #0073e6;
  color: white;
  padding: 15px;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 10px;
}

main {
  padding: 20px;
}

footer {
  background: #222;
  color: white;
  padding: 10px;
  margin-top: 20px;
}