Currently, the background color for the column header rows that are displayed in the coverage report and unit test report aggregated table widgets is a very dark grey, which doesn't seem consistent with the majority of the other widgets. The visual standards for QB seem to be for column headers to be blue and for widget headers to be a dark grey, so this dark grey header makes it seem like the data is unrelated and coming from a different widget.

Changing the background color for that particular row to the normal blue used elsewhere would make everything more consistent.