body {
  font-family: sans-serif;
  padding: 2em;
  background: #f5f5f5;
  color: #222;
}
header {
  background-color: #333;
  color: white;
  padding: 1em;
}
nav a {
  color: #ffd700;
  margin: 0 10px;
  text-decoration: none;
}
main {
  margin-top: 2em;
}