I want to have the background only from a QWidget black. The background from the QPushbuttons, QSliders etc. shoud be normal.
I use the Style-Syntax:

QWidget {
background-color:rgb(20, 20, 20);
}

I read in the Qt Assistant (Stylesheet-Syntax) that i must make bevore the QWidget a point:

.QWidget {
background-color:rgb(20, 20, 20);
}

I have now the problam that this didn't work.

Thanks for help.