body{font-family:Arial,sans-serif;background:#f4f7fb;margin:0}.wrap{max-width:900px;margin:0 auto;padding:20px}button{margin:4px;padding:10px 12px;border-radius:10px;border:1px solid #ccd}#app{background:#fff;padding:16px;border-radius:12px;margin-top:12px}.choice{display:block;width:100%;text-align:left;margin:8px 0}.ok{color:#0a7}.bad{color:#c33}