a-table设置嵌套层级表格的表头背景颜色

.ant-table-thead .ant-table-cell {
  border-right: 1px solid #939ba7 !important;
  background-color: #ceeef1 !important;
}
.ant-table-expanded-row .ant-table-thead .ant-table-cell  {
  border-right: 1px solid #939ba7 !important;
  background-color: #90d1d1 !important;
}
.ant-table-expanded-row .ant-table-expanded-row-level-1 .ant-table-thead .ant-table-cell  {
  border-right: 1px solid #939ba7 !important;
  background-color: #acc8c9 !important;
}