body { font-family: Arial, sans-serif; margin: 0; padding: 0; }
header { text-align: center; padding: 50px; background: #f2f2f2; }
h1 { color: #333; }
.btn { display: inline-block; margin-top: 20px; padding: 10px 20px; background: #0070f3; color: white; text-decoration: none; border-radius: 5px; }