When I click on the Cookie button at the bottom left, nothing happens

I think that the problem comes from the T4 template optimization, the css of the plugin are not loaded correctly
try to look at this, may be disable it in the template or exclude the plugin Cookies CK from the list

OK thanks.
For now I switched of CSS Optimization in the template.
And I asked it in a forum topic there
www.joomlart.com/forums/d/50077-conflict...-ck-and-t4-framework

Solved.
I have excluded the file front.css of the Cookie CK extension in the settings of the T4-template.

great ! thank you for your feedback