body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #fff;
  color: #333;
}

.header, footer {
  background-color: #e4f0f8;
  padding: 20px;
}

.nav {
  background-color: #00446a;
}

.nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  padding: 0;
  margin: 0;
}

.nav a {
  display: block;
  padding: 12px 20px;
  color: #fff;
  font-weight: bold;
  text-decoration: none;
}

.nav a:hover,
.nav a.active {
  background-color: #0066aa;
}

.content {
  max-width: 800px;
  margin: 30px auto;
  padding: 0 20px;
}

footer {
  text-align: center;
  font-size: 14px;
}