Changes visible in Desktop, but disappear in Mobile version

Hello everybody,

I’m going crazy with this, today I did some custom changes to my website .css and it all look great until I switch to the mobile version, it’s good for a very brief moment and then it just disappears the formatting.

I think its a conflict or something, but I can’t figure it out! :disappointed_face:

Here is the link for the website, it’s happening in at least two parts:

The “Back to Top” button here: https://kinkaju.nyc/blogs/news

The grid on the Blog Post template page, an example here: https://kinkaju.nyc/blogs/news/studio-clays-cream-halley-tracksuit-a-blend-of-style-and-comfort

Any help is very appreciated, thanks in advance!