javascript - Opacity not working as background color for popup -

i have popup created works fine, reason having issues background-color opacity. on page script runs , not getting errors. when popup first comes shows opacity, color turns bit darker , solid color rather having transparency. created fiddle, cannot replicate going on in page. in fiddle, not allow popup close, on page not case.

https://jsfiddle.net/hvltezza/

on site looks this...

i have exact same popup else on same page, jquery , not have issues.

//tech pop script     $('.admin_popup').on('click',function(){         $(".light_admin,.white_overlay").fadein("slow");     });      $('.close_admin_popup').on('click',function(){         $(".light_admin,.white_overlay").fadeout("slow");      }); 

i cannot change jquery in jsfiddle shared because has function in need page work correctly.

does see why page not allowing opacity go through?