'Angular PWA - flex and css not working on IOS

I'm new to the platform, so i don't know if i put my question on the write place.

I have a PWA made in angular. It works fine in chrome on android, but flex and css are not working on IOS.

If i have 2 lines of text on android they are looking fine, but on IOS it looks like there are 5 or 6 lines between the two lines.

Anybody an idea how to fix this?

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