Featured Image – Inline vs default

I currently have some custom CSS that I use on another site to allow my feautured images to be inline/ /* Featured images in summary view left inline with text */ .blog .entry-summary .wp-post-image, .archive .entry-summary .wp-post-image { display: inline; float: left; margin: 0 10px 10px 0; border: 0; } On another site (also using Catch Evolution Pro), I would like to selectively have some images inline and other follow the default. I tried using prefacing the above with .post-id-XXX where XXX is the post id but it didn't work. Other ideas? Can this be done?