As long as you haven’t made too many other changes to your css previously, just download the theme again and replace your style.css file with the original style.css file.
Otherwise you can use something like the Firebug plugin, or Web Developer Toolbar for Firefox to help you identify what css to change.
I have the theme on my computer in a zip file, can you please futher explain how I would do this. It looks like the only thing I changed was the text size of what I wrote. Here is my site marysheffield.com
Using FTP to access your site, upload the original style.css file to replace the one you modified.
Ok so how do I find the one that I modified?? and how do I replace it? Do I just drag the file name to the remote side? Can you give me more details. I am VERY VERY new to this. Thanks for your time.
The one you modified is called style.css — and it’s in the theme folder. You just drag the original across and when asked, say yes to delete the modified one.
OK but I dont have a style.css to drag over. All I have is the theme in a zip file. can i give you my log in info to do it?
I’m sorry but as you are using a commercial theme, you need to seek support from the theme’s vendors.