$color: #c0c4cc;
$hover-color: #606266;
.el-tree {
 background-color: transparent;
 color: $color;
 /deep/ .el-tree-node__content:hover {
  background-color: transparent;
 }
 /deep/ .el-tree-node:focus > .el-tree-node__content {
  background-color: transparent;
 }
}