First I included a banner with the banner component via loadposition into an article text.
That banner was centered and with:

<div style="text-align: center;">{loadposition joomla-module}</div>

it worked fine.
Now I switched to AdAgency and I do not find any way to center that position within the article, it is the same code

<div style="text-align: center;">{loadposition banner-im-text}</div>

Please have a look here:

The upper one is the AdAgency module position and the one below the position containing the banner module.
I already tried to look with Firebug, there stands "text-align: center", but the banner is on the left not in the center of the content area.

Same problem now in contentbottom area. You helped me to solve that with:

.banneritem {

    text-align: center;

}

That does not work anymore. Can you please tell me, what I have to put in there instead of 'banneritem'?

Hope you can help me again.