Gazette: Moving Top Banner Ad To Right

Hi, everyone. I am creating a new WP blog utilizing WooThemes’ Gazette Edition theme at https://testing-ground.info, and I am trying to figure out how to move the top banner ad to the right-hand side of the header. Not quite all the way to the right, though, as I do want a little bit of the black to show between the edges of the header and the ad.

I thought for sure I could fix it using the code below from the style.css file, but no such luck. Am I missing something here? If it’s in another file, let me know and I’ll try to work it out or, if that doesn’t work, post it up on the forum in the proper section.

Thanks in advance.

/*- Top Banner -*/
#topbanner {

	width: 960px;
	padding: 37px 0px 5px 0px;
        margin: 0 auto;
        width:960px;
}
#topbanner img{
}