CSS File not used

Hello,
I´ve got a problem.

I would have a border on the right side. So i will write to my layout a css tag and would set there a padding or margin. But nothing will change!

Here my code:

VerticalLayout rootLayout = new VerticalLayout();
		rootLayout.setSizeFull();
		rootLayout.setStyleName("pd_content_rootlayout");

and my css-Tag:

.pd_content_rootlayout {
	margin: 50px;
	padding: 50px;
}

Can anybody help?

Greetz
Dominik

Hi
try it with this

.v-verticallayout-pd_content_rootlayout {
    margin: 50px;
    padding: 50px;
}

Greets