Matrix Formatting: Column Grand Total format to match Row Format

Hi all! I've got a Matrix that looks like this (color scheme is a work-in-progress):

The last column is the Grand Total column, and I'd like for the background to match the row color so it's a bit easier to read which total aligns with which column. As you expand/collapse the rows the expanded Grand Total backgrounds should match the expanded row backgrounds.

Is this doable?

Thanks in advance!