You also may have a closer look to my post at: Coloring Table Cells with CSS - #2 by pmario
and: Highlight the background color of table merge cells (merge left and right, merge up and down) in tiddlers? - #2 by pmario
You also may have a closer look to my post at: Coloring Table Cells with CSS - #2 by pmario
and: Highlight the background color of table merge cells (merge left and right, merge up and down) in tiddlers? - #2 by pmario