widget area padding per page?

Hi all… I am setting up a site, using TwentyTen 1.2, and a child theme. I have a banner area on each page, which I have placed directly below the navigation bar. I order to get the widget area to move down and make room for this banner, I have used the following code in the child stylesheet.

#main .widget-area ul {
	margin-left: 0;
	padding: 200px 20px 0 0;
}

this works out just fine, except that I cannot seem to get the banner (or anything other than posts) to show in the content area of the blog page. Rather than struggling with the banner image issue I simply would like to make it so that the widget area does not have the 200px padding on this blog page. Is this possible to do within the child theme code, or do I have to go deeper into conditionals within the sidebar files?

thanks.