body {
  font-family: Tahoma, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  text-align: center;
}

nav {
  background: #333;
  padding: 1rem;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 15px;
}

main {
  padding: 2rem;
}

h1 {
  color: #222;
}

p {
  color: #555;
}