site updated

docs/site_libs/dt-core-1.13.6/css/jquery.dataTables.extra.css

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+/* Selected rows/cells */
+table.dataTable tr.selected td, table.dataTable td.selected {
+  background-color: #b0bed9 !important;
+}
+/* In case of scrollX/Y or FixedHeader */
+.dataTables_scrollBody .dataTables_sizing {
+  visibility: hidden;
+}
+
+/* The datatables' theme CSS file doesn't define
+the color but with white background. It leads to an issue that
+when the HTML's body color is set to 'white', the user can't
+see the text since the background is white. One case happens in the
+RStudio's IDE when inline viewing the DT table inside an Rmd file,
+if the IDE theme is set to "Cobalt".
+
+See https://github.com/rstudio/DT/issues/447 for more info
+
+This fixes should have little side-effects because all the other elements
+of the default theme use the #333 font color.
+
+TODO: The upstream may use relative colors for both the table background
+and the color. It means the table can display well without this patch
+then. At that time, we need to remove the below CSS attributes.
+*/
+div.datatables {
+  color: #333;
+}