.chat-container{max-width:500px;margin:40px auto;border:1px solid #ddd;padding:10px;border-radius:12px;background:#fafafa}.messages{max-height:400px;overflow-y:auto}.message{background:#fff;margin:5px 0;padding:8px;border-radius:8px;box-shadow:0 1px 3px #0000000d}.input-box{display:flex;margin-top:10px}input{flex:1;padding:8px}button{padding:8px 12px;margin-left:8px}