body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}
header {
  background: #003366;
  color: white;
  padding: 1em;
  text-align: center;
}
nav ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
}
nav ul li {
  margin: 0.5em;
}
nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 1em;
}
section {
  background: white;
  margin-bottom: 1em;
  padding: 1em;
  border-radius: 8px;
}
footer {
  background: #003366;
  color: white;
  text-align: center;
  padding: 1em;
  position: relative;
}