Can't set border to QDockWidget from external QSS stylesheet file

Question

I want to add borders to a QDockWidget using an external QSS file.

This is what I have:

And this is what I want:

I've tried using:

QDockWidget {
    border: 5px solid red;
}

but it doesn't work at all;

If I am using the designer by right clicking on the QDockWidget and choosing Change stylesheet and I use border: 5px solid red; inside the dialog everything works fine. But I want to use an external QSS file.

Is it possible to attach a QSS file to my widget and border it as wanted?

Answer 1

Found the solution:

QDockWidget > QWidget {
    border: 5px solid red;
}

Good luck!