Centering Banner In Module Position "banner"

Hi.

I have created a banner in Joomla and created a module for it to display it in the "banner" position. The banner is created using custom code.
But when it is displayed it is off-center in the "banner" position. It is aligned to the left.

Is there a way to center banners that appear in the "banner" module position?

Could You please post an url to your site?

I cannot because I just have it running in localhost on my mac at the moment. I haven't got it anywhere public yet.

I cant help much then. Please write back when the site will be live, or place it some where temporary so I can check the code and create correct css styling.