body { font-family: sans-serif; margin: 0; background: #ffffff; }
header, footer { background: #003366; color: white; text-align: center; padding: 10px; }
nav { background: #00509e; text-align: center; padding: 10px; }
nav a { color: white; margin: 10px; text-decoration: none; }
section { padding: 20px; }