.index-library .left{border-right:1px solid #E3E3E3;background-color:#fff;padding:10px 10px 0;position:relative}.index-library .left .tree-group{height:74vh;overflow:scroll;padding-bottom:60px}.index-library .left .group-button{position:absolute;bottom:0;width:100%;padding:10px 6px;border-top:1px solid #E3E3E3;background-color:#fff}.index-library .right{background-color:#fff}