Please replace the ??? with your data!
i really want to use this plugin… but… it's not really good form to put hacks into the actual style sheet. Better to set up another style sheet to add those using IE conditional comments.
I'd highly suggest providing style sheets, but do two things:
1) allow the user to copy said styles to their own style.css file and check some option to indicate using the wp default style sheet
OR
2) let the user copy a style sheet and images into their theme, then point to it in the form's options page.
I dont know what the total solution is – but hacks in the style sheet is bad form… as time passes, browsers change and what you think is fixed with that hack becomes a problem down the line.