Some elements had no defined size (fonts and size depending on browser settings and operating system), so I just cleaned and fixed everything so it looks similar everywhere. This also allows to change the font size in the profile (for that, the font must be coherent and linked between all elements). Also improving some for mobile use.

What is the problem exactly? Is it just because something changed? If so, after a few days/months you'll get used to it.
Or if there is a particular point, maybe it can be tweaked.