Cookie Notice plugin is not working

Hi,
I am using cookie notice plugin for my domain, named laurasgluecksbilder.de.
The issue is whenever I am accepting the cookie(clicking on ok) the cookie bar is not disappearing.
As I am using custom codes, maybe there will be some issues related to CSS.
It will be great if you could help me out in that case as soon as possible or else I have to shift to other plugins.
Looking forward to your immediate response.

Thanks & Regards,
John