body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  background: #f4f4f4;
}

header {
  background: #333;
  color: white;
  padding: 20px;
}

main {
  padding: 40px;
}

footer {
  margin-top: 50px;
  padding: 10px;
  background: #222;
  color: white;
}