body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}

header {
  background: #333;
  color: #fff;
  padding: 2rem;
  text-align: center;
}

main {
  max-width: 800px;
  margin: auto;
  padding: 2rem;
  background: #fff;
}

article {
  margin-bottom: 2rem;
}

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 1rem;
}