body { font-family: Arial, sans-serif; background: #fff; margin: 0; padding: 0; }
header { background: #004aad; color: #fff; padding: 20px; text-align: center; }
header .btn { background: #ff9900; color: #fff; padding: 10px 20px; text-decoration: none; border-radius: 5px; }
footer { background: #f1f1f1; text-align: center; padding: 10px; }