Multipage Form Smartphone Problem

Hi Folks, i’ve got a problem with multipage forms embedded in a popup. When i open the popup with the form, fill in the data on page one and click next (the button is located at the bottom), the next form-page will not open at the top but at the exact position, where i left the first page, at the bottom.

Is there any way to fix this (with css, javascript or anything else), because customers won’t see important informations this way or have to scroll back to top?

Thanks in advance
Thore, MMD