body{font-family:Arial,sans-serif;margin:0;background:#f5f5f5}
header{background:#003366;color:#fff;padding:20px;text-align:center}
nav a{color:#fff;margin:0 8px;text-decoration:none}
main{max-width:900px;margin:auto;background:#fff;padding:25px}
footer{text-align:center;background:#003366;color:#fff;padding:15px;margin-top:20px}