PS: Since I can not test the code on your website, I’m not sure if it will work properly, so if the codes do not work, please give me your WP Login credentials in a private answer and I will give you the appropriate code.
But unfortunately there is another problem. I cannot find how to change de .css menu navigation on mobile phone (the color and font size are not well).
I add mediaqueries on style.css it’s working on computer (when the window is small) but it’s not working when I look the website on mobile phone. https://www.ancrages-ecriture.fr/tempimg/screenshot_nav.png
(The website is currently online if you want to see).