body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header {
  background: #111;
  color: white;
  padding: 20px;
}

nav {
  margin-top: 10px;
}

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

main {
  padding: 40px;
}

section {
  max-width: 900px;
}

footer {
  background: #f4f4f4;
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}