Thanks for your reply.
It's not solved, maybe I didn't explain clearly.
On the first slide, many buttons are displayed, the links of these buttons all lead to tag pages such like https://test2.olkoa.fr/index.php/component/tags/tag/20-gestion
If you click on GESTION tag button, nothing happens.
Same for all tag buttons.
Similarly, on slide 2, there's one button, again ineffective.
I have tried on both Chrome and FF.
Thanks in advance for your help.