body { font-family: Arial, sans-serif; }
header { background: #333; color: white; padding: 10px; text-align: center; }
nav { margin: 20px 0; }
nav ul { list-style: none; padding: 0; }
nav li { display: inline; margin-right: 15px; }
main { padding: 20px; }
footer { text-align: center; margin-top: 20px; }