Image border problem in dynamic CSS

I’m stumped!

I am trying to change the image border of the slider main image from 10px to 2px. Firebug indicates that the CSS is coming from ?dynamic=css (line 103).

In style.css I can see .slider_default img{border:2px solid #fff;} (I changed it to 2px.) But the image still has border 10 px. I guess the code is being generated by jQuery, but I can’t figure out why the border isn’t changing.

The page is using the Overall theme by Codestar. Here is the home page: http://savingspecies.org/

Is there something I am missing? Any and all help and suggestions much appreciated!