Hi again.
This time I need to set a background color for a cell in the table. For example like the image below.

I tried using in the ditabase-derived.css:
/* blueBG {*/
[class~="hi-d/blueBG"] {
background-color: #9999ff;
}
but it only hightlight the text, not the entire cell of table.
Any answer for the coding to change table background color?