Issur pages title

Hello,

There is a problem with my website. I would like to have a fixed header which do not move or go down as we navigate the website, articles and pages. I tried to do as said on this page : https://forum.tagdiv.com/topic/how-do-i-lock-the-header/
But it doesn’t work.

Plus, on every pages of my website,the title is hidden by the header.

You can see it on this page for example :
https://goldy.fr/apropos
https://goldy.fr/mentionslegales

How can I do to have a fixed header + pages titles showing on all of my pages.

Thanks,

I found the solution. Thanks