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

header {
  background-color: #333;
  color: #fff;
  padding: 10px;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  background-color: #444;
}

nav li {
  display: inline-block;
  margin-right: 10px;
}

nav li a {
  color: #fff;
  text-decoration: none;
  padding: 10px;
}

nav li a:hover {
  background-color: #555;
}

main {
  margin: 20px;
}

section {
  margin-bottom: 20px;
}

h2 {
  color: #333;
  font-size: 24px;
}

article {
  background-color: #f7f7f7;
  padding: 10px;
  margin-bottom: 10px;
}

article h3 {
  margin-top: 0;
}

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