body {
  font-family: Arial, sans-serif;
  background-color: #333;
  color: #fff;
}

container {
  max-width: 800px;
  margin: 40px auto;
  padding: 20px;
  background-color: #444;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

header {
  text-align: center;
}

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

nav li {
  display: inline-block;
  margin-right: 20px;
}

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

nav a:hover {
  color: #ccc;
}