I've done something but don't know what......help

I have been fiddling round with the css in stylesheet to make a rounded border. I did it but prefered something else so decided to get rid. I created a top margin of about 10px so the border would display properly. Now that I have gotten rid of it and all assosiated code the margin is still there. I have gone through all of the margins and paddings and can't find anything affecting this. Any ideas. And sorry but my site isn't live yet so can't show you.

Cheers

Without being able to see the actual page the only recommendation is to delete the declaration and start again.

but is there something else perhaps in another file that could cause this margin/padding? I have gone through all of them in the css and can't find anything. I have gotten rid of all of the code i wrote prev to do with the border.