Text not visible on screen for computer view

Hello guys,

The text is not visible on the computer version in the “CMS” tab while it is clearly visible on the tablet and phone version. How could I resolve this problem? Thanks a lot

Here is the screen where there are only H1 tags and not the text

Here is the laptop version with now the text that appears normally

How to see the text again on the desktop version ?

Thanks a lot

Here is my site Read-Only: LINK
(how to share your site Read-Only link)