Vertical automatic sizing of slides cuts off top.

Hello, awesome project you got here! I have a problem using it with slides that are taller than they are wide. The automatic sizing seems to break.

Here is my website homepage where you can see it in action on the Punk 4 hovertank slider: https://rivalrebels.com/en/

This also happens with all my slides if the aspect ratio of the monitor is sufficiently wide.

Side note: impress.js doesnt seem to load *at all* on mobile, does anyone know why this would be the case?

Begin with the reproduction on the linked rivalrebels.com homepage and compare tall slides on sufficiently wide monitors. Treat the mobile-loading note as a separate report; done means vertical slides no longer lose their top content and the mobile behavior is separately explained or tracked.

Written by the indexing model from the issue text.