body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f4f4;
    color: #333;
  }
  
  header {
    background: #001f3f;
    color: white;
    padding: 20px;
    text-align: center;
  }
  
  nav {
    background: #003366;
    padding: 10px;
    text-align: center;
  }
  
  nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
  }
  
  nav a:hover {
    text-decoration: underline;
  }
  
  main {
    padding: 20px;
    background: white;
    margin: 20px auto;
    max-width: 800px;
    border-radius: 6px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
  }
  
  footer {
    background: #001f3f;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 40px;
  }