body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}

header {
  background: #1e90ff;
  color: white;
  padding: 1rem;
  text-align: center;
}

nav {
  background: #333;
  display: flex;
  justify-content: center;
}

nav a {
  color: white;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  display: block;
}

nav a:hover {
  background: #555;
}

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

footer {
  background: #222;
  color: white;
  text-align: center;
  padding: 1rem;
}