body { font-family: Arial, sans-serif; margin: 0; padding: 0; }
header { background: #222; color: #fff; padding: 10px 20px; }
header h1 { margin: 0; }
nav a { color: #fff; margin-right: 15px; text-decoration: none; }
.hero { padding: 40px 20px; background: #f5f5f5; }
footer { text-align: center; padding: 10px; background: #eee; margin-top: 40px; }