body { font-family: Arial, sans-serif; text-align: center; margin: 0; padding: 0; }
header { background: #f9f9f9; padding: 30px; }
.logo { max-width: 150px; }
section { padding: 20px; }
footer { background: #222; color: #fff; padding: 15px; }
button { margin: 10px; padding: 10px 20px; }