Mod-card CSS styling works on Mac/Safari but not iPad/HAapp

I use the mod-card plugin to enable CSS styling of dashboard cards.

I added a pixel margin to cards in a panel view, in order to have cards not touching the side of the panel view. This works perfect when logging in to the HA dashboard on Mac using Safari.

Strangely, CSS styling does not work when logging in on an iPad with the Home assistant app. Am I supposed to make a mod-card installation/configuration on each front end device, not only on the backend?

I suggest you to ask this question on a dedicated thread.
Find a thread called like “Card-mod - super-charge your themes” and provide a more detailed info including your code for the modding.

The problem has solved itself. It turns out that it was a local cache in the ios app. Going into ios settings, storage management, I could “offload the app” and reinstall it. that purged some app caches and it now works fine.

Not needed to reinstalll the App, there is a “Reset frontend cache” button in the settings.

But - surely there are some diffs in CSS for Chrome, Safari for Mac & Safari for iOS.
Some CSS props have different possible values, for instance.
Some styles may only work in Chrome & not work at all in iOS.