How to make transparent background for QWidget?

Question

Qt

There is a QWidget with several QLabels on it. How can I make the root QWidget transparent and the QLabels placed on it opaque?
Those. in other words, how do I keep only child widgets visible?

Answer 1

And what's the problem? It seems to be transparent by default.
Well, in any case, for this, it is most likely worth looking towards stylesheet qt-project.org/doc/qt-5/stylesheet.html