body {
  font-family: 'Helvetica', sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  color: #333;
}
header {
  background-color: #004080;
  color: white;
  padding: 20px 0;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 20px;
}
nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 20px;
  max-width: 800px;
  margin: auto;
}
section {
  margin-bottom: 40px;
}
h2 {
  border-bottom: 2px solid #004080;
  padding-bottom: 5px;
}
footer {
  background-color: #eee;
  text-align: center;
  padding: 10px;
}