.App{display:flex;justify-content:center;padding:20px}.chat-room{width:100%;max-width:600px;border:1px solid #ccc;border-radius:8px;display:flex;flex-direction:column;height:80vh}.message-list{flex-grow:1;padding:20px;overflow-y:auto;border-bottom:1px solid #ccc}.message{margin-bottom:10px}.message-input{display:flex;padding:10px}.message-input input{flex-grow:1;padding:8px;border:1px solid #ccc;border-radius:4px;margin-right:10px}.message-input button{padding:8px 16px;border:none;background-color:#007bff;color:#fff;border-radius:4px;cursor:pointer}