body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {
  background-color: #003366;
  color: white;
  padding: 20px;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  padding: 0;
}
nav ul li a {
  color: white;
  text-decoration: none;
}
main {
  padding: 20px;
}
footer {
  background-color: #f2f2f2;
  padding: 20px;
  text-align: center;
}