[Lynne]

I would suggest bookmarking the link in my sig to w3schools. It will help you to do this on your own instead of having to wait for someone else to do it.

In total, you'll need these lines:

/* first article centered with larger image */
.fullwidth > div.article_preview .cms_article_preview_image {max-width: 300px !important; max-height: 300px !important; float: none;; text-align: center;}
.fullwidth > div.article_preview .cms_article_txt_content {    clear: both; ; text-align: center;}
.fullwidth > div.article_preview, .fullwidth > div.article_preview .cms_article_section_location {text-align: center;}

only tested in firefox.