That is such a minute thing. You’re going to have customize the CSS to make it look exactly how you want. You’ve got many elements and approaches you can utilize there. I simply cannot guarantee that every 3rd-party plugin is look identical in all circumstances. It would be one thing if you were using a popular plugin and it was completely breaking the page or something, but this is a little bit of a reach.
For CSS changes, it’s a good idea to use a tool like firebug or Google Chrome’s built-in developer tools to locate them and then put the edits either in your child theme or in the “Custom CSS” option on your theme options page.
Also, here’s a helpful tutorial on how to use Firebug – http://vimeo.com/20917974. The only thing I’d suggest not doing is actually making edits to the theme’s CSS files, as it shows at the end of that video. However, the video serves as a good introduction to Firebug and how it can be used to find what CSS is effecting certain areas of your site without ever digging around in any files.