*{box-sizing:border-box;margin:0;padding:0}body{width:100%;max-width:600px;margin:0 auto;padding:0 15px;font-family:Noto Sans JP,sans-serif;font-size:14px}.header-info{text-align:center;margin-top:30px;margin-bottom:20px}#chat-form{flex-direction:column;align-items:center;width:100%;padding:3px;display:flex}.input-row{align-items:center;gap:10px;width:100%;margin-bottom:10px;display:flex}#chat-text{border:2px solid #ccc;border-radius:5px;flex:1;padding:10px}#send-button{background:#82e0ff;border:none;border-radius:5px;width:auto;padding:10px}#error-message{color:#d32f2f;margin-top:8px}#timeline{margin:0;padding:0;list-style-type:none}#timeline li{padding:5px 10px}#timeline li:nth-child(odd){background:#eee}.scroll-text{white-space:nowrap;padding-left:100%;font-size:50px;display:inline-block}