.message-list{text-align:center}h1{font-size:24px;margin-bottom:20px}ul{list-style:none;padding:0}.message-item{border:1px solid #ccc;padding:10px;margin-bottom:10px;background-color:#f5f5f5}.avatar{width:40px;height:40px;border-radius:50%;margin-right:10px}.sender-info{display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-align:center;-ms-flex-align:center;align-items:center}.sender-name{font-weight:700;margin-right:5px}.message-time{color:#888}.message-content{color:#666;margin-top:10px}