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

header, footer {
  background: #f4f4f4;
  padding: 1rem;
}

nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #333;
}

main {
  padding: 2rem;
}