Stylesheet of QGroupBox does not work properly

[deleted485]

Hello,
I have some widgets (a 2x2 table and 2 labels) inside a QGroupBox. Everything works as expected. See Picture:

But then I want to change the color of the border. I use

groupbox.setStyleSheet("QGroupBox {border: 1px solid black;}")

Which has the wanted effect of changing the color, but it also seems to mess up some margins or paddings. See picture:

So how do i change the border color/size/radius without touching the other parameters?
And how do i change the title size without touching anything else?
Or what are the parameters i need to change with that, to make it look like the first picture?

Thanks in advance

[JonB]

@Moesen said in Stylesheet of QGroupBox does not work properly:

But then I want to change the color of the border.

Then why not use border-color: black so as not to alter anything else like the border size?

Also, you may get different effects (desirable or not) via groupbox.setStyleSheet("border-color: black;") without the QGroupBox?