body{margin:0;background:#111;color:#fff;font-family:Arial;display:flex;justify-content:center;align-items:center;height:100vh}.container{text-align:center;max-width:360px}.logo{width:180px}.btn{display:block;margin:15px auto;padding:14px;background:#2ecc71;color:#fff;text-decoration:none;border-radius:10px}.btn:last-child{background:#333}