body { font-family: Arial, sans-serif; background-color: #f9f9f9; margin: 0; padding: 0; color: #333; }
header { background: #000; color: #fff; padding: 20px; text-align: center; }
nav ul { list-style: none; padding: 0; }
nav ul li { display: inline; margin: 0 15px; }
nav ul li a { color: #fff; text-decoration: none; }
section { padding: 20px; text-align: center; }
.btn { background: #000; color: #fff; padding: 10px 20px; text-decoration: none; border-radius: 5px; }
footer { background: #000; color: #fff; text-align: center; padding: 10px; }