Images and links

To get back to the Home page of my site, I used a button with a link above an image. On the “Home” page, it works perfectly on any screen, but on the other pages, the button is not where it should be on the website once published (especially on small screens). As far as I can tell, I’ve used the same settings as for the home page, and I can’t figure out why it reacts any differently.
Does anyone have any ideas?
Thanks a lot!

Here is my public share link: [LINK][1]