body {
  font-family: 'Segoe UI', sans-serif;
  background: #fefefe;
  color: #111;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}
header {
  background: #2c3e50;
  color: white;
  padding: 2rem 1rem;
  text-align: center;
}
nav {
  background: #34495e;
  text-align: center;
  padding: 1rem;
}
nav a {
  color: white;
  margin: 0 1rem;
  text-decoration: none;
}
section {
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
}
footer {
  text-align: center;
  padding: 1rem;
  background: #eee;
}