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

.container {
  max-width: 800px;
  margin: auto;
  overflow: hidden;
}

header {
  background-color: #3498db;
  color: white;
  padding: 1rem 0;
  text-align: center;
}

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

nav li {
  float: left;
}

nav a {
  display: block;
  color: white;
  text-align: center;
  padding: 1rem;
  text-decoration: none;
}

nav a:hover {
  background-color: #2e86c1;
}

main {
  padding: 2rem;
}

footer {
  background-color: #f1c40f;
  color: white;
  text-align: center;
  padding: 1rem 0;
}