body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f9f9f9; color: #222; }
header { background: #222; color: #fff; padding: 15px; text-align: center; }
header h1 { margin: 0; }
nav ul { list-style: none; padding: 0; }
nav ul li { display: inline; margin: 0 10px; }
nav ul li a { color: #fff; text-decoration: none; }
main { padding: 20px; }
footer { background: #222; color: #fff; text-align: center; padding: 10px; margin-top: 20px; }