body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  color: #222;
  margin: 0;
  padding: 0;
}
header {
  background-color: #003366;
  color: white;
  text-align: center;
  padding: 1.5em 0;
}
nav {
  background-color: #0055a5;
  padding: 0.5em;
  text-align: center;
}
nav a {
  color: white;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 2em;
}
footer {
  background-color: #003366;
  color: white;
  text-align: center;
  padding: 1em;
  position: relative;
  bottom: 0;
  width: 100%;
}