iOS: ion-slide pushing content out of screen

Ionic Framework ionic-v3
1

I have a page with HTML code like the following simplification:

<div id="main-container">
  <ion-slides>
   <!-- ... -->
  </ion-slides>

  <div>
    <button ...>...</button>
  </div>
</div>

On Android this works, but on iOS the button is pushed nearly out of the screen at the bottom so the user can only see it’s upper border and not interact with it.
Is there a way to position/force the button below the pager onto the screen like it would be on Android?