.topic-list{margin-right:-20px}.topic-list li{float:left;width:210px;height:210px;overflow:hidden;position:relative;margin-right:20px;margin-bottom:20px;background-color:#fff}.topic-item img{height:100%}.topic-item .title-box{position:absolute;bottom:0;left:0;height:44px;line-height:44px;width:190px;padding:0 10px;color:#fff;font-size:14px;text-align:center;background-color:#333;background-color:rgba(0,0,0,.6);transition:all .3s ease-out;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}