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

#container {
  width: 80%;
  margin: auto;
  background: #fff;
  padding: 20px;
}

#header {
  background: #222;
  color: #fff;
  padding: 20px;
  text-align: center;
}

#nav {
  background: #333;
  padding: 10px;
}

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

#nav ul li {
  display: inline;
  margin-right: 15px;
}

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

#main {
  padding: 20px;
}

#footer {
  text-align: center;
  color: #aaa;
  font-size: 0.9em;
  margin-top: 40px;
  border-top: 1px solid #ccc;
  padding-top: 10px;
}