Ah, okay. Sticky posts only are differentiated when they appear in lists, like the home page, but there is not a way to style sticky posts separately for individual posts like that.
Also, the individual posts display a date heading on the right followed by the post date and time as well as category links.
You could remove just the heading part, but note that it would affect all posts not just sticky ones:
Or you could remove all of the post meta completely like this:
Add one example or the other to your Appearance → Custom Design → CSS page and click the preview button to try them out.