body {
  font-family: Arial, sans-serif;
  margin: 0;
}
nav {
  background: #333;
  padding: 10px;
}
nav a {
  color: white;
  margin: 10px;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
.content {
  padding: 20px;
}