UI Table Adjustments

I found this thread and imported the example and played around with the values but none of the color settings are taking effect. In fact, the only change I can see from the original table style and the new style after importing the ui_template node, is that the "sorting arrow" of each column is hidden. Which is correct. I have moved the ui_template node into the tab and group where the ui_table resides. Does anyone know why the other CSS styling isn't taking effect?