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

header {
  background-color: #333;
  color: #fff;
  padding: 20px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav a {
  color: #fff;
  text-decoration: none;
}

main {
  padding: 40px;
}

footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
}