.el-tree-node__content{height:auto;.custom-tree-node{&.level1{font-weight:600}>.tree-node-operation{display:inline-block;margin-left:20px;visibility:hidden;opacity:0;transition:opacity .4s;.del-btn{margin-left:10px}}}&:hover .custom-tree-node>.tree-node-operation{visibility:visible;opacity:1}}