elementPuls_Treeg更改颜色 

 .el-tree {
      background: transparent;
      color: #fff;
    }
    :deep(.el-tree-node__content:hover) {
      background: rgba(2, 167, 240, 0.5);
    }
    //选中的背景色
    :deep(
        .el-tree--highlight-current
          .el-tree-node.is-current
          > .el-tree-node__content
      ) {
      background-color: rgba(2, 167, 240, 0.5);
    }
    //点击时背景色
    :deep(.el-tree-node:focus > .el-tree-node__content) {
      background-color: rgba(2, 167, 240, 1);
    }
    :deep(.el-tree-node__expand-icon) {
      color: #fff;
    }
    :deep(.el-tree-node__expand-icon.is-leaf::before) {
      display: none;
    }

    :deep(.el-tree-node:focus > .el-tree-node__content) {
      background-color: rgba(2, 167, 240, 1);
      color: #fff;
    }
    :deep(
        .el-tree--highlight-current
          .el-tree-node.is-current
          > .el-tree-node__content
      ) {
      background-color: rgba(2, 167, 240, 1);
      color: #fff;
    }
    :deep(.el-tree-node__loading-icon) {
      color: #fff;
    }