Unwanted padding on QWidget

[etru1927]

I'm trying to add a generic widget (to be used as a container for other widgets) to a dock widget, and there's some padding I can't seem to get rid of. Can I overwrite this somehow? I've tried using stylesheets but no luck.

In the attached image: said widget with orange background (for testing purposes) is sandwiched between two labels, with correct padding. Widget contains two other widgets in a couple layouts with default values.