How do i style a toplevel widget?

[Nyte]

This is an issue I'm having trouble with for a long time, and usually have a workaround for, but at this time... i can no longer use my workaround.

How do i style a top level widget

I have a .ui file with 2 objects.:

QWidget (MyQWidget)

QListWidget (MyQListWidget)

In my .css file, I just cannot style the QWidget. Say with a simple border or background. Here's what i experimented.

* {border: 1px solid red}

* {border: 1px solid red}

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Works, but obviously gives everything else a border as well

QWidget {border: 1px solid red}

QWidget {border: 1px solid red}

To copy to clipboard, switch view to plain text mode 

Works, but gives every QWidget a border as well

#MyQWidget {border: 1px solid red}

#MyQWidget {border: 1px solid red}

To copy to clipboard, switch view to plain text mode 

Doesn't work

QWidget #MyQWidget {border: 1px solid red}

QWidget #MyQWidget {border: 1px solid red}

To copy to clipboard, switch view to plain text mode 

Doesn't work

QWidget > #MyQWidget {border: 1px solid red}

QWidget > #MyQWidget {border: 1px solid red}

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Doesn't work

#MyQWidget QWidget {border: 1px solid red}

#MyQWidget QWidget {border: 1px solid red}

To copy to clipboard, switch view to plain text mode 

Doesn't work


My usual workaround was just to add another QFrame and give it no margins. Anything below the Toplevel widget i can easily style, but not the top-widget itself.
Can anyone please educate me how to properly style the topwidget?

[Ginsengelf]

#MyQWidget {border: 1px solid red}

This works for me, at least with a minimal example in Designer with Qt 5.8.

Ginsengelf