body{margin:24px;font-family:system-ui,sans-serif;color:#17202a}main{max-width:640px;margin:0 auto}h1{font-size:24px}button{margin-bottom:16px;padding:8px 12px;cursor:pointer}#scroll-container{outline:1px solid #94a3b8}.message{box-sizing:border-box;padding:12px;border-bottom:1px solid #cbd5e1;background:#eff6ff}pre{padding:12px;background:#f1f5f9}