.chat-window{max-width:600px;margin:auto;border:1px solid #ddd;border-radius:8px;overflow:hidden;display:flex;flex-direction:column;height:500px;box-shadow:0 2px 4px rgba(0,0,0,.1)}.messages{flex-grow:1;overflow-y:auto;padding:10px;background-color:#f9f9f9;display:flex;flex-direction:column-reverse}.message{padding:8px 15px;border-radius:20px;margin-bottom:10px;max-width:70%;word-wrap:break-word}.user-message{background-color:#e0f7fa;margin-left:auto;text-align:right}.other-user-message{background-color:#fff9c4;margin-right:auto;text-align:left}.message-input{border:none;padding:15px;font-size:16px;outline:none;width:100%;box-sizing:border-box}#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50;margin-top:60px}