body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f5f5f5;
  color: #333;
}
header {
  background-color: #004080;
  color: white;
  padding: 1em;
  text-align: center;
}
nav ul {
  display: flex;
  justify-content: center;
  list-style-type: none;
  padding: 0;
}
nav ul li {
  margin: 0 1em;
}
nav ul li a {
  color: white;
  text-decoration: none;
}
main {
  padding: 2em;
}
footer {
  background-color: #eee;
  text-align: center;
  padding: 1em;
  position: fixed;
  bottom: 0;
  width: 100%;
}