maybe it’s not a problem - but a design decision for ios. I suggest inspecting the element and modifying the css to fit your needs - otherwise you could just force the app on ios to be displayed in material design mode (idk if this is a good idea with the review from apple and so on, but it could be an solution)
Do you have a mac to run it in an simulation? or do your friends have iphones that you can invite on a beta testflight program before publishing the app?