[Plugin: Testimonials Widget] Quotes css change?

Hi,

This is a great widget, thank you! I just wondered if it was possible to change just the 2 ” marks so they are larger and maybe a different colour? I’m not sure from the css file how i would be able to do that, is it possible?

Thanks in advance!

http://ww.wp.xz.cn/extend/plugins/testimonials-widget/