body {
  font-family: Arial;
  margin: 0;
  background: #f5f5f5;
}

header {
  background: #111;
  color: white;
  text-align: center;
  padding: 30px;
}

main {
  max-width: 800px;
  margin: 20px auto;
  background: white;
  padding: 20px;
}

a {
  color: blue;
  text-decoration: none;
}

footer {
  text-align: center;
  padding: 20px;
}