how remove the line underscores

Hi all

How I can remove the line underscores in my quotes page here ?

http://carlboileau.com/les-citations-utilises-dans-ce-blogue

I put this code :
text-decoration:none !important; il the style sheet of the plugin… but nothing happens.

TY for your attention

http://ww.wp.xz.cn/plugins/quotes-collection/