How to turn of the inner border for Facebook 'Like Button' in IE7/IE8?

I have seen that even on big sites like CNN, etc. have it. I tried targeting the element which showed up those edges in IE developer toolbar but it didn't work. Check out the link and hover over the 'like' button...it shows some kind of inner black 开发者_开发知识库border in all four corners.

http://developers.facebook.com/docs/reference/plugins/like/

There's a bug in Facebook's CSS. Line 170 says

.connect_widget .like_button_no_like:hover .corner{background-position:10px 61px}

But it should in fact say 10px -95px.

The other background-position values are probably wrong as well, but I don't know how to trigger them.