Hide Radio Button

Hi all, i am using WP 3.9.1 with gravity Forms registration addon.I would liek to hide the radio button but I am not able to do so…
i wrote the following code in the Class Name CSS
” .hideradio input[type=”radio”] { display:none; }”

someone could help me?

https://ww.wp.xz.cn/plugins/gravity-forms-addons/