How do I style the bottom right section of a QTableView (past the scrollbars)?

[Esor]

I gave my QTableView a red border, and in the far bottom right this border appears darkened or translucent. How can I control the appearance of that little square? I couldn't find any mention of a subcontrol for this in the docs.

It is pretty subtle here, but more obvious in the full stylesheet theme I'm working on so I need to control this.

[Bonnie]

That bottom right is the corner widget of a scroll area.
You mean control it by stylesheet?
Then it is the ::corner sub-control.