Removing extra spacing around QWidget

Question

How to remove extra spacing around QWidget?

Here's the simple example. The widget's space is grey; you see, there's some space (about 0.3-0.4 cm) around the content of it (image, text and button).

Widget's space was highlighted by

setAutoFillBackground(true);
QPalette pal(palette());
pal.setColor(QPalette::Background, QColor("#e5e5e5"));
setPalette(pal);

Here's the content (highlighted by running setStyleSheet( "background-color: red"); for the whole widget.

By 'removing extra spacing' I mean removing about 0.2-0.3 cm of grey space around content.

Answer 1

Change the contents margins of the layout you added the QWidget to and any other layout you wish to change by using the method setContentsMargins().