stephencottontail on "I need a little help with my theme"

Ah, I didn't notice it was in an <iframe>. There's probably no way to do what you're trying to do. If you could somehow move the <iframe>'s contents to the same domain, you could write some JavaScript to do it, but most browsers won't allow cross-domain JS for security reasons. Your best bet is to contact your plugin's authors to see if it's possible to set CSS properties for their plugin.