body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #e0f7fa, #ffffff);
  color: #333;
}
header, footer {
  background: #003366;
  color: white;
  text-align: center;
  padding: 15px;
}
nav {
  background: #0055a5;
  overflow: hidden;
}
nav a {
  float: left;
  display: block;
  color: #fff;
  text-align: center;
  padding: 14px 20px;
  text-decoration: none;
}
nav a:hover {
  background: #003366;
}
.container {
  padding: 20px;
  max-width: 1000px;
  margin: auto;
  background: rgba(255,255,255,0.9);
  border-radius: 10px;
}
h1, h2, h3 {
  color: #003366;
}
footer {
  margin-top: 20px;
  font-size: 14px;
}