body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}

header {
  background: #0052ff;
  color: white;
  padding: 20px;
  text-align: center;
}

nav ul {
  list-style: none;
  padding: 0;
}

nav ul li {
  display: inline;
  margin: 0 15px;
}

nav ul li a {
  color: white;
  text-decoration: none;
}

main {
  padding: 20px;
  max-width: 800px;
  margin: auto;
  background: white;
}

section {
  margin-bottom: 30px;
}

footer {
  background: #222;
  color: white;
  text-align: center;
  padding: 10px;
}