Dear @edouard

I’m sorry that you are not able to customization, I am giving you some example, it will may help you.

You will find the body tag to /root/resources/views/layouts/header.blade.php and closing body tag in /root/resources/views/layouts/footer.blade.php

If you like to change anything from home page, edit /root/resources/views/home.blade.php
For the edit single campaign details, please see the /root/views/campaign_single.blade.php

Hope it will help you

Best regards