* Visit https://pl.m.wikipedia.org/wiki/Krak%C3%B3w_Wis%C5%82a#/media/Plik%3AWisla4.jpg
* Make sure that the map pin "Kraków Wisła" is present in the unscrolled view (zoom out if necessary)
* Click an image to load the image overlay
Expected:
Overlay overlays all content
Actual:
MultimediaViewer popup on mobile allows article content to "leak through".
For example: https://pl.m.wikipedia.org/wiki/Kraków_Wisła#/media/Plik%3AWisla1.jpg
{F17460723}
The "pin" and label from the location map in the infobox is visible while MultimediaViewer popup is open. Article screenshot for comparison:
{F17460748}
The same works correctly in desktop mode: https://pl.wikipedia.org/wiki/Kraków_Wisła#/media/Plik%3AWisla1.jpg, because the popup (`<div class="mw-mmv-wrapper">`) has `z-index: 1001`. These styles (and indeed this entire element) are missing on mobile.
= Developer notes
We may have to bump z-indexOverlay and @z-indexOverOverla to extremely high number.